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[[quoteright:350:[[Film/{{Spaceballs}} http://static.tvtropes.org/pmwiki/pub/images/handscanner.jpg]]]]
[[caption-width-right:350:"Thanks for lending me a hand there, mate."]]
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->'''Kryten:''' Logically, sir, there is only one way you could possibly have opened that door. I feel quite nauseous. -- Where is it?\\
'''Lister:''' Where's what?\\
'''Kryten''': [''horrified''] Oh, sir, ''you've got it in your '''jacket!'''''\\
'''Lister:''' I got us out of the hold, didn't I?\\
'''Kryten:''' Sir, you are ''sick!'' You are a ''sick, sick person!'' How can you possibly even conceive of such an idea?\\
'''Lister:''' Hey, cheer up... or I'll beat you to death with the wet end.\\
'''Kryten:''' Sir, if mechanoids could barf, I'd be onto my fifth bag by now...
-->-- ''Series/RedDwarf'', "The Inquisitor"

Once upon a time, infiltrating a base was pretty easy: just knock the guards out, take the keys, and get in. Fortunately, modern high-tech facilities, or in TheFuture have more cunning devices, and can identify the guards by unique biological features, such as handprints or retinal scans. These cunning devices are reliable, efficient, and not prone to believing just anyone who happens to be [[DressingAsTheEnemy wearing the right uniform]]. Great, huh?

Unfortunately, the more dangerous individual won't need to get your guards to agree: He'll find someone with the right access, and engage in some very [[EyeScream unpleasant surgery]]. He may remove a guard's eye, or he may simply lop off his or her head and hand with a big ol' sword. Then equipped with those body parts, he'll simply apply these to the biometric authentication device in question, and get through.

This raises the question of whether or not any such devices would be able to tell whether the hand or eye in question was attached to a living body. In reality, this actually is a key consideration in designing biometric security. Some devices (the cheaper ones, mostly) ARE vulnerable to this kind of thing. Needless to say, such a weakness is considered an absolute disqualification for usage in any classified government facility.

This is rarely used by good guys unless they're LateToTheTragedy and there's already a surplus of corpses, as it's definitely on the morally dubious side of things, even if you don't kill the victim. A more moral person may have to talk or threaten the guard into showing his [[IncrediblyLamePun Eye-D]], or simply wrestle the poor {{mook|s}} into place.

Note that this is not about bypassing biometric scanners in general. This is about the ''bloody'' way to get around them.



[[folder:Anime and Manga]]
* ''Manga/InuYasha'': In a fantasy example, Sesshomaru grafts a human arm onto his body to get around Tessaiga's "cannot be wielded by a full demon" limitation.
* In ''Anime/PsychoPass'', Makashima uses extracted eyeballs and severed fingers to enter a facility which uses biometric security rather than the setting's more prevalent cymatic scan security.
* An unusual example occurs in ''Manga/TokyoGhoul'', providing one of the clues to the true nature of the GovernmentConspiracy. Early on in the series, HalfHumanHybrid Kaneki is able to bypass the scanner gates used to detect ghouls. The reason for this is only revealed in the sequel: [[spoiler: It's because the scanners have been programmed to ignore certain ghouls, including the one Kaneki received an involuntary organ transplant from]].
* [[spoiler: Junko Enoshima]] does this in ''Anime/DanganRonpa3'' by ''spooning out'' the eye of one of the members of the school board in order to [[spoiler: access the room where Izuru Kamukura is held]].

[[folder:Audio Plays]]
* In the ''AudioPlay/BigFinishDoctorWho'' audio play ''[[Recap/BigFinishDoctorWho011TheApocalypseElement The Apocalypse Element]]'', the Daleks make their way through the capitol using the eyes of dead guards to bypass the retinal security locks.

[[folder:Comic Books]]
* ComicBook/TheJoker once gained access to a government vault by Joker toxin-ing the guards and dragging one over to a biometric scanner. The vault, incidentally, held Doomsday.
* ''ComicBook/ArkhamAsylumLivingHell'':
** Used by fellow Arkham inmate Jane Doe in an attempt to escape through an emergency exit requiring a fingerprint scan, retinal scan, and voice ID. As Jane's modus operandi is wearing the skin of the people she kills and taking over their identities, she was well prepared, bringing her latest victim's severed hand and preserved eye, plus a recording of the victim pleading for her life.
** Killer Croc bit off a guard's hand, but didn't eat it; somehow or other the lunatic scavenger Junkyard Dog got a hold of it, preserving it in a jar and, when he gets the chance, using it to bypass a handprint scanner to aid in his escape.
* In a ''Weird Worlds'' story, when an elevator SelfDemonstrating/{{Lobo}}'s hijacked reaches his destination, the doors won't open. The elevator attendant explains that they're tied to his DNA, the sensor for which is several floors up, where they just came from, but the elevator won't go back up because he didn't have the chance to use the sensor when Lobo got on. Since there's no ceiling between them and the sensor, Lobo just blows the attendant's brains out, splattering his blood on the sensor.
* ''Comicbook/JudgeDredd'' spinoff ''Tempest'' had the protagonist arrested at one point. He breaks free and steals a pair of lawgivers. To bypass the ID lock and SelfDestructMechanism, he ''tears the skin from the hands of the judges he disarms''.
** The main strip itself had an episode where a judge lost their hand along with the lawgiver it was holding. Two random citizens find it and discuss selling it. One says it's a bad idea, while the other notes that with the corresponding judge's hand still attached, that the SelfDestructMechanism is not a problem.
* ''ComicBook/HackSlash'': In ''Slice Hard'', Ashley cuts the fingers off a guard and uses them to bypass the fingerprint scan on the biometric lock on the lab.

* Used in ''Film/ShootEmUp''. [[TheDragon Hertz]] smugly informs [[AntiHero Smith]] that the gun he just took from his mook has a safety that requires a thumbprint to activate. Cue Smith removing the mook's hand from his pocket. Hertz grabs a knife and charges Smith as he presses the dead thumb against the grip sensor. It doesn't look like it's going to work for a moment, then the gun fires.
-->'''Smith:''' [[BondOneLiner Nothing like a good handjob]].
* Simon Phoenix in ''Film/DemolitionMan'' gets through a door locked with a retina scanner by removing the authorized man's eye. Surprisingly having a pen jammed into it (to hold it with) doesn't seem to obscure the retina at all. Upon learning that all transactions are performed through microchips implanted in the user's hand, John Spartan notes that Phoenix can't mug anyone for money, "...unless he rips off somebody's hand, and let's hope he doesn't figure ''that'' one out." This one goes untested, and presumably they could always cancel the account of anyone minus a hand.
* In ''Film/{{Spaceballs}}'', Lone Starr knocks out a guard and uses his hand to get into the self-destruct device chamber.
* ''Film/JamesBond''
** In ''Film/DieAnotherDay'', Bond and Jinx get past a hand scanner by severing the arm of a recently killed henchman and pressing it against the scanner.
** In ''Film/NeverSayNeverAgain'', the remake of ''Film/{{Thunderball}}'' (both starring Creator/SeanConnery as Bond), a bad guy had an eye transplant to get past a retinal scanner protecting some nuclear weapons.
** A harmless version in ''Film/TomorrowNeverDies'', where he uses a cell phone gadget that scans the print of whoever used the device last and the shows the phone display to the thumbprint scanner.
** Played with in ''Film/DiamondsAreForever'': Bond is equipped with a thumbprint skin of the guy he's impersonating; Tiffany tests the print in secret after lifting it from a drink tumbler. Good thing she tested the correct finger.
* In ''Film/DoubleTeam'', Creator/JeanClaudeVanDamme's character cuts out the skin of his own thumb to provide time-needed biometrics while he is elsewhere.
* Subverted in ''Film/{{District 9}}''. Since the alien weaponry can only be used by an alien hand, various attempts are made to use severed arms to fire the guns. That doesn't work, though, since the arms need to be ''alive''.
* In TheFilmOfTheBook of ''Film/TheDeadZone,'' John Smith has a vision of Gregory Stillson as president. Stillson is hot to launch a nuclear strike at the Soviet Union, but to activate the Nuclear Football, he needs a general's handprint-scan in addition to his own. Stillson tells the general, "Put your hand on that pad or I'll cut it off and do it myself!"
* Used by [[ActingForTwo one of]] Creator/ArnoldSchwarzenegger's characters in ''Film/The6thDay ''. He cuts off the thumb of a character (along with some other things) and then uses it to both start up a truck, and get into high security areas in the cloning facility. However the woman who lost her thumb has been cloned again, so when she tries to get into the same area the system refuses her, tipping off the bad guys what is happening.
* In ''Film/BackToTheFuturePartII'' we see a brief glimpse of a news article in 2015 that says "Thumb Bandits Strike Again". Since all monetary transactions in that future are done by thumb scanners, criminals would start to steal victims' thumbs.
* In ''Film/{{Doomsday}}'', a dying infected man armed with an axe uses this method to break into the building sheltering [[spoiler: the UK's Prime Minister]].
* In ''Film/MinorityReport'', the protagonist's wife used his eye to enter the [[spoiler: prison where he's being kept. The eyes are actually his own leftover eyes after he gets a new pair of eyes to hide his identity]]. This invokes a FridgeLogic issue as of why his eyes have not been revoked access [[spoiler:after he is captured and put in prison]].
* A healthy trade for blood samples, urine samples, fingerprints, dandruff, and hair existed in the movie ''Film/{{Gattaca}}''. The protagonist used this to [[strike:break a glass ceiling]] fake the identity of another man, but presumably others used the black market in biologicals for more nefarious purposes.
* In both the book and the film of ''Film/AngelsAndDemons'', a CERN scientist's eye is cut out to fool a retina scanner.
* In ''Film/{{Doom}}'' the movie, Sarge takes the severed arm of a dead scientist and places the palm on an access scanner to obtain the {{BFG}}.
* A robotic version appeared in ''Futureworld'', the sequel to ''Film/{{Westworld}}''. A door has a device that scans the retinas of anyone trying to get in. To pass, you must have a pattern that only robots possess. The {{heroes}} deactivate a robot and rip off its face, then use the face (and its eyes) to fool the device.
* ''Film/{{Ultraviolet}}'' has a system to scan someone entering a secure facility to make sure they aren't vampires. It involves two thick needles ''stabbing the subject in the wrists''. Getting around it by temporarily altering one's blood seems fairly simple.
* In ''Film/NationalTreasure'', Gates uses Chase's thumbprint he acquired to infiltrate the vault storing the Declaration of Independence.
* In ''Film/TheAvengers2012'', Loki and his minions use a fancy piece of stolen S.H.I.E.L.D. tech that lets them scan someone's eye and turn it into a hologram good enough to fool a retina scanner. Loki probably didn't ''have'' to [[EyeScream jam it right into the poor man's eye socket though]]...
* The ship in ''Film/AlienResurrection'' had locks that could only be opened by a cleared individual breathing onto a scanner. Call has a keyring full of sprays, presumably containing substitute versions of the officer's spit.
* The first ''Film/CharliesAngels'' film has them steal the fingerprints (off a beer bottle) and a retina scan ([[ItMakesSenseInContext with a tuba]]) of two [=VPs=], both of which have to be used simultaneously to open the vault. They then create a glove and a contact lens with the print and the scan.
* In ''Film/PacificRim'', [[spoiler:the portal is keyed to open only to {{Kaiju}}, so in order to get past that restriction, Gipsy Danger tackles the final one and dives through the portal with it, killing it on the way down.]]
* Proving you don't ''have'' to live in a high-tech world to use this trope, in ''Film/ConanTheBarbarian2011'', Conan cuts off a jail guard's head and holds it up to a torture chamber's small window, allowing the torturer to recognize it's his "fellow guard" knocking. As soon as the man opens the door, Conan knocks him silly [[GrievousHarmWithABody with the head]].
* Used as a threat in ''Film/DragonFighter''. Stuck in an underground research facility with raging dragon, the main character asks a lab technician for his laptop, which is needed to let everyone out. The technician tells him that the laptop is in his room, which is locked with a biometric lock. But since the monster is between them and the room, he is unwilling to go there. Frustrated, the main character grabs a cleaver and nearly hacks the guy's hand off in order to scare him to come with him.
* In ''Film/BatmanVSupermanDawnOfJustice'', Lex Luthor carves off the fingerprints of General Zod's corpse with a kryptonite scalpel and uses them to gain access to to the crashed Kryptonian scout ship. Using this access as a stepping stone, he creates access for himself.
* A non-lethal version in ''Film/GhostInTheShell2017''. Major simply hauls over an Yakuza goon she's knocked unconscious and uses his thumbprint to open the futuristic handcuffs he placed on her wrist earlier.
* Attempted in ''[[TheMummy2017 The Mummy]]'' to escape Dr. Jekyll's office. [[spoiler: Turns out Mr. Hyde has different fingerprints...]]
* In ''Film/ResidentEvilTheFinalChapter'', Alice tries to ride an Umbrella Corp. motorcycle, but it detects she isn't an Umbrella employee and electrocutes her. The second time she finds one, she chops off Isaacs' hand and presses it to the handlebar, which works. She drops the hand and it is quickly eaten by a zombie, but she is still able to ride it.
* In ''Film/{{Zygote}}'', the creature [[TheAssimilator assimilates the bodies]] of those it has killed, allowing it to get past the facility's finger print scanners. [[spoiler:At the end, Barklay chops off one of the creature's appendages for the same reason, although she has trouble locating a finger with the proper security credentials.]]
* In ''Film/TheSnowman2017'', the villain kills a police detective and chops off her index finger in order to gain access to the fingerprint-protected police database.

* Used in one of the ''Literature/ArtemisFowl'' books, although they later reattach the finger via magic.
** In a later book, the fairies have one that is specifically designed to detect a pulse in order to prevent this (justified due to the fact that it was designed by Foaly).
** The final book has the ultimate form of this: [[spoiler:the use of Opal's clone to deactivate her DoomsdayDevice]].
* In the Creator/DanBrown novel ''Literature/AngelsAndDemons'', physicist Leonardo Vetra gets his eye cut out to get past a retinal scan.
* In the first ''[[Literature/TheLastChancers Schaeffer's Last Chancers]]'' book, the team has to bypass a palm scanner that can detect whether the hand still has a pulse running through it. They circumvent it by removing the hand an authorized officer, then surgically attaching it to one of the team member's wrists, via some tubes so he can hide it in his pocket.
* Something similar in Creator/LoisMcMasterBujold's ''Literature/MirrorDance'', although here's it's a code-key embedded in a ring, not a biometric. Sounds squick-free? No, because the ring in question is apparently ''riveted to the owner's finger bone'' and quite impossible to remove...
** And to get past the lock requires both the ring, and a palm print. The palm locks in that verse actually do read heat, pulse, and electrical conductivity -- as the protagonist points out, "dead hands don't open palm locks." Mark had to use some super assassin hacking skills to get past that.
* In ''Literature/HaloFirstStrike'', UNSC headquarters has finger scanners... which release a blood-drawing needle during the scanning.
* In one of the ''Literature/WomenOfTheOtherworld'' books, the doors of the top secret facilities are unlocked by fingerprint readers embedded in the door knobs. Our hero ambushes a guard and applies the logical solution to their problem.
* Discussed in ''[[Literature/TheLeagueOfPeoplesVerse Ascending]]''. Uclod demonstrates his LivingShip's security features to Oar, including the fact that it won't operate until confirming his DNA, palmprint, and fingerprints. Oar is unimpressed:
-->'''Oar:''' That is foolish. If criminals wished to impersonate you, they could simply cut off your hand. Then they could rub the detached member against the wall--
--> '''Uclod:''' Whoa! Just whoa. What is ''wrong'' with you, missy? How can such grisly ideas pop into such a pretty head?
-->'''Oar:''' I am simply practical. Unlike your Zarett's security precautions, which would seem to encourage villains to amputate--
-->'''Uclod:''' Hush! Right now. Not a word.
* In ''[[Creator/IsaacAsimov Robots and Empire]]'', two villains disagree on how best to perform their mission. One has a gun. The other's thumb is needed to work the required equipment. The armed one states that if he'll blow off the other's head off, the thumb will be quite intact.
* In Creator/SergeyLukyanenko's ''Literature/ALordFromPlanetEarth'' amongst one of the Precursors' artefacts there are little one-time use devices capable of making planets barren wastelands. However, they need to be activated by a human hand. Attached to a living human being capable of reasoning its activation. Yes they tried other options, including a severed warm human hand.
* ''[[Franchise/StarWarsExpandedUniverse Rebel Force: Trapped]]'' has Luke Skywalker going through an Imperial base with a stolen passcard just fine until he reaches a palm scanner. Fortunately, it was guarded by the only two stormtroopers he'd encountered in the base who were inclined to shoot first, so he could kill them and use one's hand without violating his MartialPacifist preferences.
** Similarly, ''The Young Han Solo Trilogy'' has Han infiltrating an Imperial command center as part of a plan to fend off an expected Imperial attack on [[WretchedHive Nar Shaddaa]]. Han ends up killing an Imperial admiral in his office, but notes that it would be impossible to use the dead man's eye to bypass the retinal scanner protecting the safe in his office.
* In Creator/KimNewman's ''Literature/DarkFuture'' novel ''Krokodil Tears'', via a severed hand, this is how Jessamyn bypasses the security system locking down Bronson Manolo's [=DeLorean=] in Dead Rat.
* In the opening scene of John Varley's ''The Ophiuchi Hotline'', the mysterious agents helping the heroine escape from death row start by amputating her arm so they can replace it with one from someone who has access to the DNA-coded prison locks. She isn't worried, though, because cloned parts and limb transplants are routine, simple procedures in this universe. ([[FridgeLogic Which leads one to wonder]] why DNA-sensitive locks would be considered reliable security measures in the first place.)
* In ''[[Literature/{{Daemon}} Freedom]]'' this is a favourite tactic of the Major, who [[spoiler:rescues girls from brothels, gets them darknet accounts and then beheads them to steal the identities, keeping them chemically alive to spoof the biometrics. He tries to pull this off on Loki, taking the man's eyes, fingertips and tongue, but is caught before he can actually assume the identity.]]
* In ''Literature/DannyDunn, Scientific Detective'', when Danny learns that the kidnapped man's handprint is necessary to open a vault, he asks if the scanner will still read the print if the hand is cold. It takes a few moments for the other characters to realise what he is hinting at.
* ''[[Literature/CiaphasCain Cain's Last Stand]]'': Cain expects Varan's forces to try this, so as he and his cadets are escaping the governor's palace he [[DestructionEqualsOffSwitch puts a lasbolt through the genecode scanner]] that controls the entrance to the escape tunnel.
* In the ''Literature/KnownSpace'' universe, [[OrganTheft organleggers were known to harvest people for their organs]]. In one "Gil the ARM" story, it's noted that eyes are particularly in demand by criminals, to get past retina scanners with transplanted eyes from some organlegger victim.

[[folder:Live Action TV]]
* In one of the ''{{Series/Lexx}}'' movies, Giggerota ripped off Stan's hand so she could pilot Lexx without him. The former Shadow brains provided the voice.
* In ''Series/RedDwarf'' (Inquisitor), Lister and Kryten get [[RetGone replaced]] by another Lister and Kryten, who subsequently get killed (and blown up). Lister uses other-Lister's severed hand to open a door, leading to the exchange quoted above.
* In ''Series/DarkAngel'', a man got both his eye gouged out and his hand cut off (at two different occasions by the same guy) so that the maiming guy could get into two different high security installations after he had gone rogue from the evil corporation he used to work for.
* ''Series/{{Torchwood}}'', "End of Days" with Capt. Jack. He's not killed ''for'' it but it's revealed after Owen kills him that they need his retinal scan to okay the use of the Rift Manipulator, so they hold his corpse up to the scanner. [[{{Immortality}} Like always]], Jack gets better.
** In ''Series/TorchwoodMiracleDay'', Jack and Gwen use non-invasive methods to get the biometric data from their target... the assassin chasing them, however, is a little more pressed for time. Bonus points for needing [[spoiler:both a hand and an eye]]. The tissue in question is immortal and thus still counts as alive, ripped off or not.
* The ''Series/MythBusters'' tested biometric fingerprint scanners, including a top of the line model which was supposed to read body temperature, salinity, and electrical current, but they all proved very easy to fool.
** To wit: One of them was fooled by a ''black and white computer printout of the finger in question'' (that had been licked to cover salinity/perspiration).
** They also found that the expensive reader sold to be used as a door lock was easier to fool than the cheap one used as a log-in device on a laptop. At least, that was the ''perception'' the hosts had; they apparently forgot that by figuring out how to pass a ''basic'' fingerprint lock, they'd ''already overcome'' perhaps the biggest obstacle of the biometric fingerprint scanner (namely, the "fingerprint" part)--at that point, the ''only'' obstacle to overcome was the "biometric" part of it, which turned out to be the easier task.
* The pilot episode for the proposed TV adaptation of ''ComicBook/GlobalFrequency'' inverts the usual crisis -- while storming a secret prison, Miranda Zero is completely prepared to get past the retinal scanner, but runs into trouble when it turns out to be a ''password-protected'' scanner.
* ''Series/ThreatMatrix'' has a related example where Israeli agent attempts to frame a Palestinian agent for a hit by wearing [[{{Squick}} the dead man's fingers]].
** In another episode, Vila got round a scanner by doing the lifting fingerprints trick.
* ''Kessler'' (a 1981 spin-off of ''Series/SecretArmy'') has the title character informing his fellow war criminals in South America that they can't access his Swiss bank accounts by cutting off his hand, as the system only works with a living hand.
* ''Series/{{Alias}}'': During Marshall's AllUpToYou story, he accidentally shoots a foe while attempting to furtively assemble a ScaramangaSpecial. With the enemy dead and unable to be bluffed into allowing him past, he has no choice but to remove his eyes, coached by Jack. The first attempt, with a knife, doesn't go so well, but then he finds a spork, which works better.
* In a ''Series/StarTrekTheNextGeneration'' episode, a genetically engineered SuperSoldier got around the fact that the commbadges were keyed to fingerprints by knocking out a guard and using his finger to activate it.
** In a different episode, a time traveler from the past with a stolen time machine from the future (got that?) tries to kidnap Data. Since his handprint is required to open the door, nobody has been able to get into or to even scan the inside of the craft. Once the time traveler learns that he can't incapacitate Data (due to his stolen phaser being disabled), Data subtly but effectively convinces him to give himself up.
--->'''Data''': I assume your hand print will open this door, whether you are conscious or not.
* In the ''Series/StarTrekDeepSpaceNine'' episode "Who Mourns for Morn?" a member of a criminal group that had performed a heist years ago threatens to do this to Quark, needing his thumb to sign for delivery of a package (containing the stolen money). Another member of the group points out that they can't very well expect to be taken seriously if they use a severed thumb to sign the invoice.
* In ''{{Series/Jekyll}}'', Hyde is obviously a bit gleeful about this one--to the point where he puts the victim's severed thumb in a lunch box and abruptly presents it to a passing scientist:
-->"Give this to Dr. Gilligan."
-->"What is it?"
-->"(smiling) He'll recognize it."
* The husband of Ilsa Pucci from ''Series/HumanTarget'' was killed for his eye, so his lawyer could get into a biometrically-sealed vault to steal his identity.
* In the fourth season of ''Series/BurnNotice'', it's Lampshaded, when Larry laments that he doesn't have a bonesaw with which to remove the dead Brennen's left hand.
* The paintball game show ''Crossfire'' had one "mission" to steal a handily tanked "eyeball" to use on the enemy base biometric scanners. Since on at least one occasion the entire team were wiped on that mission, the host had a tank with his gran's eyeball in - "because who could refuse a little old lady access?"
* Subverted in ''Series/{{Fringe}}'' in the season 5 episode "In Absentia". It's set up that the team will need to use a captured guard's retina to enter a secure building, and Walter asks for a scalpel and a spoon, and we return from an act break to see him cutting into a removed eyeball, [[EyeScream accidentally botching it]], and then asking Astrid for another. As it turns out, he had a jar of preserved pig's eyes lying around and can forge the retina pattern into them.
* In ''Series/{{Angel}}'', Angel has to get into [[OccultLawFirm Wolfram & Hart]], so he kidnaps AmoralAttorney Lilah Morgan and says he wants the same thing from her that he got from Lindsey (a colleague who had a hand amputated by Angel). Cut to Lilah sensibly pressing her still-intact thumb against the scanner as Angel waits menacingly by her shoulder.
* Subverted in ''{{Series/Dollhouse}}''. Sierra infiltrates the National Security Agency by knocking out a female NSA worker and stealing her identity. She also takes a high-resolution photograph of her eye, which is then copied onto a contact lens.
* In the pilot of ''Series/{{Helix}}'', knowing his own subdermal RFID chip has been deactivated, Peter Farragut, a research scientist infected with TheVirus, kills and maims a member of his research facility's security team, [[AnArmAndALeg severing his lower arm]] in order to obtain a valid chip and access labs containing other researchers. All the better to carry out TheVirus's behavioral imperative to infect others.
* ''Series/BlakesSeven'': {{Discussed}} in ''Space Fall'' when Gan threatens to take off the guard's hand if he doesn't use it to open the door with a palm scan. The guard wisely agrees.
-->'''Gan:''' Look, we just need the hand. If you want to stay attached to it (grins), do as you're told.
* ''Series/{{Castle}}'': In "In Plane Sight", Castle and Alexis use the thumb of the murdered air marshal (still attached to his body) to unlock his cell phone.
* In ''Series/{{NCIS}}'', the Port-to-Port Killer once left an eye ball in an ice cube in Tony's drink at a bar. On a hunch, Jimmy brings it up to MTAC, and the door opens. We later see the man to whom it belongs (belonged), alive and well, just with an eye patch.
* In the ''Series/{{Supergirl 2015}}'' episode [[Recap/Supergirl2015S2E7TheDarkestPlace "The Darkest Place"]], Cadmus steals some of [[Comicbook/{{Supergirl}} Supergirl's]] blood (via hypodermic syringe) so that they can use it to break into [[spoiler: the Fortress of Solitude]]. So this is simultaneously bloodier and less violent than other uses of trope.
* Done in ''Series/SevenDays'', when Frank beats up a guard and then realizes he needs a valid handprint to pass a secure door.

[[folder:Tabletop RPG]]
* ''TabletopGame/{{Shadowrun}}''. This is noted in ''The Neo-Anarchists' Guide to Real Life'' as a way to fool biometric security devices (such as doors and credsticks). Unfortunately, the devices' designers have figured this out and altered the devices to check and see if the body part being used is still alive and attached to a body. Until they have a way to make sure the body part is attached to a ''conscious'' body, all they've done is add a bit more work.

[[folder:Video Games]]
* AfterfallInsanity features a hospital mission where the retinal and fingerprint scans of two doctors are required to end a security quarantine. Guess what you have to do when your enemies are insane and dual-wielding any melee weapons they can find?
** [[spoiler: FridgeBrilliance occurs when it's revealed the main character is just insane - there are two "insane" doctors who jump out when trying to retrieve the body parts. You just kill them and take theirs instead.]]
* ''VideoGame/DeadSpace2'' has access to certain areas keyed to the [=RIGs=] of a certain user. Thankfully, their corpse is usually nearby for you to hold up to the scanner with Kinesis.
* {{Subverted|Trope}} in ''VideoGame/MetalGearSolid2SonsOfLiberty'': it's stated up front that the retinal scanner in the Shell 1 core can't detect dead eyes, so the player has to drag a guard to the scanner and mash his face into it.
** Used in a more comprehensive way with the football. The nuclear launch codes in the presidential briefcase require the President's complete biometrics and are able to detect deviations from the expected readings, thereby preventing any agency from coercing him or using removed tissues. [[spoiler:President Johnson willingly activated the nuclear weapons on Arsenal Gear because he wanted more power than the Patriots allowed him and Ocelot killed him in retaliation]].
** Played straight in ''VideoGame/MetalGearSolid4GunsOfThePatriots'', Old Snake had to take a dead soldier's gun. Since the gun only reacts to the soldier's nanomachines, Snake had to bleed the soldiers out over the gun so he can use it.
** You can either cut off a mook's left hand and use the data stored in it to open a gate in VideoGame/MetalGearRisingRevengeance or just cut the locks open with Raiden's AbsurdlySharpBlade.
* Likewise in ''VideoGame/SplinterCell'', though you need a breathing, conscious person for the retinal scanner, as the scanners can tell if they're living or dead.
* In the flash series BeingOne, on your way to escape the lab you're held in, you have to scavenge blood samples and sometimes whole organs to get past the security robots.
* Used straight in ''VideoGame/{{Fallout 2}}'' in an abandoned Military Base. Retinal scanners operating locks in various sections of the base require specific eyes to unlock.
* Averted in ''VideoGame/PredatorConcreteJungle'', where scanners require a scientist to unlock. It's unknown if the predator could just rip off the heads since he is strong enough to simply drag them to the scanners and ram them in hard enough to kill them while opening the door.
** But played straight in ''VideoGame/AliensVsPredator2010'' where the Predator has to use a severed head to open several doors with retinal scanner locks.
* Used in the original ''VideoGame/SystemShock'', where you can use the entire head of an (already-dead) officer onboard the ship to reach an optional area. The door is locked via retinal scanner, so you need to look around the level for a head whose eyes are [[EyeScream relatively intact]].
* Used in ''Videogame/AloneInTheDark2008'' in the museum, where you need to use a sword to hack off a guard's arm to get past a scanner. It's all right, he's already dead.
* Quite gruesomely done in ''VideoGame/ResidentEvil4'' where after defeating Mendez in his plaga form, his false eye pops out, whereupon Leon scoops it up and puts it in the scanner. If you examine the glass eye (probably because you're wondering [[FridgeLogic why in the heck]] a ''retinal scanner'' can read it), you learn that the glass eye [[{{Handwave}} had an encryption on the outside, which is what the scanner reads]].[[note]]Which makes perfect sense when you consider the highly mutagenic nature of the stuff the bad guys are playing with: retinas are probably not the same after being exposed to Las Plagas, so they use an immutable object, the glass eye.[[/note]]
* The combination of glass eye and retinal scanner also pops up in ''VideoGame/TheLongestJourney''.
* ''VideoGame/ShadowMan'' has a variation on this in the prison level. It's actually a keycard scanner, but the card in question is being held in a [[IncrediblyLamePun death grip]] and can't be removed without taking the hand.
* ''VideoGame/BuffyTheVampireSlayerChaosBleeds'' requires you to pick up a severed hand to use on a fingerprint scanner and later on ''a severed head'' for a retinal scanner.
* Used in ''VideoGame/Prey2006'', with a severed alien hand which even gets progressively mankier throughout the game.
* In [[VideoGame/{{D}} WARP Software's]] ''VideoGame/EnemyZero'', one of the items Laura Lewis collects is a hacked-off pair of fingers, which she uses to bypass a DNA scanner. Stay classy, WARP.
* The 2005 FPS ''VideoGame/{{Area 51}}'' had one puzzle be solved by picking up the severed hand to a guard and placing it on a scanner while you hit the other one. Later, you had to pick up a severed head to get through a retinal scanner.
* This is a solution to get to the shuttle bay and steal a shuttle in ''VideoGame/SpaceQuestVIRogerWilcoInTheSpinalFrontier''. The shuttle bay entrance is guarded by two security guards, who won't let Roger inside. After knocking them out, Roger realizes that both buttons have to be pushed simultaneously in order to open the doors. He goes to the ship's android Lieutenant Commander Circuit Sidney and asks to borrow his arm. After using his own arm and Sidney's to open the door, he realizes that the shuttle can only be started by an authorized crewmember, which Roger (despite being an AlmightyJanitor) isn't. He goes back to Sidney and asks for one of his eyes (why a senior officer would give his body parts to a janitor without explanation is not explained), which he uses to fool the shuttle's retinal scanner.
* ''VideoGame/QuakeII'' has a locked door, with the item required to open it being a Commander's Head.
* ''VideoGame/{{Xenogears}}'': [[spoiler:When Bart's enemy Shakan learns that the "Fatima Jasper" needed to unlock the Fatima Treasure is in fact the brilliant blue-green eyes possessed by members of the royal bloodline, he exhumes the bodies of Margie's parents and plucks out their eyeballs.]] It's kind of hard to call this KickTheDog, since this character can't walk two feet without punting a puppy. But that doesn't mean it's not incredibly satisfying to beat him in the BossBattle.
* In ''VideoGame/{{Penumbra}}: Black Plague'' you get past several security scanners like this, using blood to enter the kitchen, then a hand and head to enter the library. Interestingly, one door that leads to the cryogenic freezer has a hand scanner that when you try to scan the hand you have already procured at this point, tells you that the person whom this hand belongs to is in critical condition and will not accept it.
* ''VideoGame/{{Strife}}'' has a very early example where you need to get through a hand scanner-locked door to complete the mission, but the person whose hand is necessary is not at all feeling cooperative. The solution? Kill him, and his bloodied, severed hand will drop as an inventory item for you to use to get through the door. Your MissionControl partner will comment on this brutality.
* The ''VideoGame/DukeNukem'' game ''Land Of The Babes'' makes you pick up an enemy's head to get past a retinal scan.
* In ''VideoGame/ZombiU'', part of the final mission involves tracking down the zombified [[spoiler: Dr. Knight]] so you can use his eye to get past a retinal scanner.
* True to their nature, the protagonists in the ''VideoGame/{{Prototype}}'' games don't just settle for the necessary bodypart, opting to instead [[ImAHumanitarian consume their target entirely]] and then just turn into them when necessary.
* Markus from ''VideoGame/LastHalfOfDarkness: Beyond the Spirit's Eye'' cut off his best friend's finger after killing him, and you must retrieve the severed digit to enter the deceased friend's lab.
* In ''VideoGame/TransformersFallOfCybertron'', Grimlock smashes Hardshell's face into an optical scanner to open a door.
* In ''VideoGame/GhostRecon: Future Soldier'', you manhandle a guard into taking a retinal scan.
* Subverted in ''VideoGame/HitmanAbsolution''. The biometric scanners you run into are state-of-the-art. Not only will using a dead enemy not work, but forcing a hostage's head into the scanner will ALSO fail, since the device can detect (presumably via pupil dilation and rapid eye movement) that they are under duress. The only way to trick a scanner is to either use disguises to trick an authorized person into opening it for you... or [[CuttingTheKnot just go hack the computer controlling the scanner, and register yourself as authorized]]. The password's probably on a sticky-note attached to the monitor.
** Played straight in the ''Videogame/{{Hitman|2016}}'' reboot in the Colorado stage, where the biometric lock requires target Sean Rose's face, meaning that you either get the man himself to open it or you use a 3D-printed mask.
* In ''VideoGame/BioShockInfinite'', Booker and Elizabeth reach the gate of Comstock House, only to find that the security scanner at the gate requires Lady Comstock's handprint. Because Lady Comstock is dead and perfectly preserved within an airtight coffin, Elizabeth decides to break into her tomb and hack off her arm - though she also makes it pretty clear that this is also a form of revenge for [[spoiler: having her imprisoned in Monument Island as a child.]] Unfortunately, [[BigBad Father Comstock]] finds out about this and [[spoiler: uses the Siphon to resurrect the corpse as the Siren, a merger of a still-living version of Lady Comstock from another dimension and Elizabeth's hatred and self-loathing]].
* During Issue #7 of ''VideoGame/TheSecretWorld,'' the player ends up trying to break into an [[MegaCorp Orochi]] research facility hidden under the Transylvanian forest - only to be kept out by a biometric lock requiring both a palmprint and a retina scan; thankfully, there are plenty of dead Orochi security guards strewn about the area, allowing you to collect the necessary... components... with ease.
* A pair of doors in Pandora's Temple in ''VideoGame/GodOfWar'' are locked with the heads of the architect's sons.
* In the ending of ''VideoGame/{{Descent}}'' ''3'', the Material Defender uses[[spoiler: the hand on Dravis' corpse to deactivate the robot virus]].
* A low-tech version in ''[[Videogame/{{Manhunt}} Manhunt 2]]''; in order to enter a heavily guarded club, Daniel has to cut off a guard's head and hold it up to the peephole on the door. The doorman will let him in thinking his colleague is still alive.
* In the Big Bank heist in ''VideoGame/{{PAYDAY 2}}'', one step in sneaking through the Benevolent Bank's security concerns bypassing a thumbprint scanner. Bain has somehow acquired a disembodied thumb (whose model happens to be far larger than any other model's thumbs) and doesn't bother explaining where he got it.
** Averted in the Hoxton Revenge heist. If the panic room has a retinal scanner, and the FBI boss happens to be killed, then the stealthy part of the heist goes out the window, as the scanner needs an eye with a pulse.
** During the Boiling Point heist of the ''Film/HardcoreHenry'' DLC, the scanner has a chance to require the lead scientist's handprint. Unfortunately, the lead scientist is a little on the dead side, having been ImpaledWithExtremePrejudice on some rebar. Still, you only need his hand...
* In episode 2 of ''Videogame/TalesFromTheBorderlands'', the characters are faced with a retinal scanner that requires the eye of General Pollux, who happens to be in a case nearby. When they find that he's wedged in too tight to move over, Fiona is forced to use a spork to gouge out an eye and accidentally destroys the first one after being startled by Rhys. Upon activating the scanner, they get a pre-recorded message from the General himself in which he states that he's going into suspended animation and asks anyone who is seeing this to activate the revival protocol. Cue silent horror from the characters as they look at the now-eyeless Pollux...
* The non-fatal version is used for a bit of mood-lightening comedy in ''VideoGame/TransformersFallOfCybertron.'' After cornering and defeating the Insecticon Hardshell, Grimlock reaches into the turret that Hardshell had been using and drags the Decepticon out, bashing him about before smashing him facefirst into a wall...whereupon the scanner there cheerfully accepts that bit of violence as Hardshell's access scan and opens the door. At least Hardshell got to keep his head--Sharpshot wasn't quite so lucky.
* The Doom Slayer in ''Videogame/Doom2016'' has to bypass several UAC biometric locks by using the appropriate body parts from deceased employees with the right clearance. The game lampshades this in the interface when he uses someone's upper torso to access the BFG weapon vault.
* During the "Demon Trafficking" sidequest of ''VideoGame/ShadowWarrior2'', Larry, Lo Wang's demon gun dealer, tells him that the Yakuza sex traffickers that Wang wants to rescue some demons from are holed up in a compound that requires a retinal scan. Wang lampshades this by asking "Are you saying the entrance fee is one dead Yakuza head?"
* A curious aversion in ''VideoGame/MetroidPrime3Corruption''. Samus routinely has to press her hand to various scanner switches in order to activate them, and her normal hand works just fine for even enemy scanners of different species. It makes sense that that she can activate Galactic Federation scanners (with human handprints) since she works for them, and somewhat sense that she can activate (four-fingered) ancient Chozo scanners since she is part-Chozo, but then she can also activate (three-fingered) Space Pirate scanners just the same. It's never stated if the PoweredArmor she wears is hacking the scanners or something.
* ''VideoGame/PathOfExile'' uses a fantastical version in Act 5. The sanctum of the Templar order is protected by the power of the god Innocence, and only those who "see with the eyes of true faith" can enter. Fortunately one of the High Templar's inner circle is nearby and fighting to put down the slave rebellion the player has joined. Your quest-giver tells you to pluck out Casticus's eyes after killing him and the good Justicar will "see" you through the wards.

[[folder:Web Comics]]
* Used in ''Webcomic/ChoppingBlock'' [[http://choppingblock.org/d/20010417.html here]]
* [[http://www.poisonedminds.com/d/20010716.html Done]] [[http://www.poisonedminds.com/d/20090803.html twice]] in ''Webcomic/{{SSDD}}'', and kind of an IronicEcho when you consider the second one was chronologically before the first.
* [[http://www.schlockmercenary.com/2004-05-09 Suggested]], though not actually used in ''Webcomic/SchlockMercenary'' during the [[AffectionateParody CSI parody arc]].
* ''Webcomic/TheAdventuresOfDrMcNinja'': [[http://drmcninja.com/archives/comic/21p61/ "Allow me to perform a simple amputation, and I'll be right back."]] {{Subverted}} in that the dinos have figured that trick out. [[http://drmcninja.com/archives/comic/21p62/ So they have to do something different]].
* CatGirl Naveed uses this in ''Webcomic/{{Zap}}'', during her breakout from a maximum-security prison. [[http://www.zapcomic.com/2004/05/20050527/ Access granted, Mr. Stevens...]]
* Subverted in ''Webcomic/PowerNap'': Drew takes [[spoiler: Cornelius]]'s head (which was previously severed) and carries it on the train in a trash bag, in order to get through the security in his apartment building... only to find out it's a slummy place with no retinal scanner.
* In [[http://www.teamfortress.com/theshowdown/ this]] ''WebComic/TeamFortress2'' comic, [[VideoGame/TeamFortress2 the Heavy]] needs to get past a handprint scanner to get into [[spoiler: the Administrator's secret base]], so he elects to use a recently-deceased {{Mook}}'s severed arm.

[[folder:Web Original]]
* Apparently Hadriex went through all the trouble to [[http://www.youtube.com/watch?v=z5pmxOXixf4 build a hand scanner]]... [[SubvertedTrope That accepts glove prints]]. Presumably they won't wake up to find their hands missing anymore.

[[folder:Western Animation]]
* Unusual example in ''WesternAnimation/SherlockHolmesInTheTwentySecondCentury'': rather than cutting them off, the thieves cloned thumbs and eyes to fool scanners. [[ArtisticLicenseBiology This wouldn't work in real life]] because neither retina patterns nor thumbprints are based on DNA.
* In the ''WesternAnimation/TransformersPrime'' episode "Alpha and Omega", Megatron has his right arm replaced with that of a deceased Prime, so he can use the Forge of Solus Prime, which could only be wielded by a Prime.
* In one episode of ''WesternAnimation/StrokerAndHoop'', Stroker sneaks into a high-security facility and finds he needs to pass a handprint scanner. No problem, just drag the guard he knocked out a minute ago over and put his hand up to it. Then he has to pass a ''urine sample'' scanner. Uncomfortably, he uses the guard to get past this, too -- only for the next guard he sees to pull a gun on him as he walks by, having seen the whole thing over the security cameras.
* Reference by Pam in "El Secustro" on ''WesternAnimation/{{Archer}}''. She asks how the kidnappers expect to get past the biometric security, mentioning that if they killed her the only way would be to cut out her eyes and chop off her thumbs. She tells them to not be dicks, and leads them straight to the ISIS offices.
* Subverted in ''WesternAnimation/FamilyGuy''. Peter, Quagmire, Joe, and Cleveland are trying to break in to Carter's vault to rob him. When voice identification is required, Cleveland successfully mimics Carter's voice. When penile identification is required for the next door, Quagmire just sticks his penis in and breaks the scanner.
* ''WesternAnimation/{{Futurama}}'': In "A Clone of My Own" the crew uses an entire bucket of Cubert's blood to trick the Near Death Star guards into thinking Fry is Prof. Farnsworth, whom Cubert is a clone of. The guards complain that a few cells would have been sufficient.
* In ''WesternAnimation/GetEd'', a robotic assassin dispatches several MechaMooks, but when it tries to use one's arm to open a container, [[SubvertedTrope it turns out that only works when the arm is attached to a body that gives it power]]. So it [[EasilyDetachableRobotParts pops its own arm off]] and attaches the other robot's arm to ''[[DoubleSubversion itself]]''.
* It's fairly common practice in ''WesternAnimation/VoltronLegendaryDefender'' to use severed arms and hands of Galran MechaMooks this way.

[[folder:Real Life]]
* Averted for the iPhone 5s print scanner. It is designed to read only living tissue. If someone were to lop off someone's thumb, the device would not be able to read it, and the effort would be in vain. Unless the person managed to attach it to someone else and kept it alive. Better details [[http://www.engadget.com/2013/09/16/why-a-disembodied-finger-cant-be-used-to-unlock-the-touch-id-se/ here.]]
** Until someone realized that a living tissue could be under the dead one, or a less grim example; a latex print of the target's fingerprint they got off a glass and even build from pictures alone [[http://www.huffingtonpost.com/2014/12/30/hack-phone-fingerprint-photographs_n_6395730.html]]. Even licking the false print is enough sometime.
* Some Android phone manufacturers (most notably Samsung) have attempted user authentication by facial recognition. Unfortunately such systems could be defeated with the use of masks, or even photographs! The upcoming (at the time of writing) iPhone X attempts to avert this problem by using a 3D facial scanner and attempts to distinguish living faces from masks by looking for facial twitches, etc. How effective it will be remains to be seen.
* Scarily enough, real life criminals know ways they can get your fingerprints off beverage containers and similar surfaces you've touched and use them for all sorts of ill purposes, [[ParanoiaFuel including framing you for their misdeeds!]]
** There ''are'' ways to distinguish faked fingerprints from real ones; however, investigations generally don't employ tests that refined unless the police have other grounds to suspect such forgery. Not to mention most criminals are petty criminals and won't go through all that effort and/or are not smart enough to do so. [[CuttingTheKnot It's a lot easier to just smash the case and wear gloves.]]
* Some high end vehicles sold in nations where carjacking is a serious problem require a fingerprint to start the vehicle. Early versions of these systems didn't confirm the finger was alive, leading criminals to the obvious solution to steal such a car.
* The James Bond example mentioned in the film section above is actually TruthInTelevision. As early as the 1970s, surgical procedures were developed by the United States military to alter a person's retina. Why? It was to duplicate someone's retinal patterns for retinal scans.
* The Irish-American gang The Westies were reputed to refrigerate the severed hands of people they had killed, so they could plant their fingerprints on murder scenes so the police would be hunting someone who was actually dead.