History Main / LieDetector

31st Oct '17 8:08:03 PM PaulA
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* {{Parodied|Trope}} in ''Literature/DiaryOfAWimpyKid: Cabin Fever'' when the school is vandalized. The police come there to question the worst troublemakers, but it's obvious that their "foolproof lie detector" is just a photocopier. Whenever the troublemaker says something they don't like, they hit a button to copy a sheet that says "He's lying". Predictably, they fail to catch the real culprits.

to:

* {{Parodied|Trope}} in ''Literature/DiaryOfAWimpyKid: Cabin Fever'' ''Literature/DiaryOfAWimpyKidCabinFever'' when the school is vandalized. The police come there to question the worst troublemakers, but it's obvious that their "foolproof lie detector" is just a photocopier. Whenever the troublemaker says something they don't like, they hit a button to copy a sheet that says "He's lying". Predictably, they fail to catch the real culprits.
24th Oct '17 8:34:36 AM Eddy1215
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* The use of a lie detector was actually PlayedForDrama in an episode of ''Series/TheJeffersons'' where Lionel was offered a high paying job. At his interview, after answering all questions given to him, he was obligated to answer them again while hooked up to a lie detector. Feeling he was being denied his rights, he turned the job down, much to George's anger.

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* The use of a lie detector was actually PlayedForDrama in an episode of ''Series/TheJeffersons'' where Lionel was offered a high paying job. At his interview, after answering all questions given to him, he was obligated to answer them again while hooked up to a lie detector. Feeling he was being denied his rights, he turned the job down, [[SkewedPriorities much to George's anger.anger]].
24th Oct '17 7:53:03 AM MathsAngelicVersion
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Added DiffLines:

* {{Parodied|Trope}} in ''Literature/DiaryOfAWimpyKid: Cabin Fever'' when the school is vandalized. The police come there to question the worst troublemakers, but it's obvious that their "foolproof lie detector" is just a photocopier. Whenever the troublemaker says something they don't like, they hit a button to copy a sheet that says "He's lying". Predictably, they fail to catch the real culprits.
18th Sep '17 3:04:03 AM Kalaong
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** The show, which bases its detection off people's faces, hates polygraphs. The characters point out that your reaction is going to be altered if say, a hot chick walks in and takes over the lie detector exam. Also that you might as well use a large egg being held in your hands as one, because if you are under stress and squeeze and break it, that could indicate that you're lying. In one episode, they show it's possible to beat a polygraph by taking a depressant to decrease your body's stress reaction.

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** The show, which bases its detection off people's faces, [[YouCanAlwaysTellALiar microexpressions]], hates polygraphs. The characters point out that your reaction is going to be altered if say, a hot chick walks in and takes over the lie detector exam. Also that you might as well use a large egg being held in your hands as one, because if you are under stress and squeeze and break it, that could indicate that you're lying. In one episode, they show it's possible to beat a polygraph by taking a depressant to decrease your body's stress reaction. The main character can make utter hash out of not just polygraphs, but ''his own system'' - in the pilot episode, he tests a recruit by ''faking'' stress.



** Robocop was literally a walking lie detector. He used "voice stress analysis" to make instant, near-infallible truth assessments. The one time it failed was when interrogating a city councillor, who as a career politician was such an instinctive liar that every statement he made (even a baseline response such as his name) registered exactly halfway between truth and falsehood.
** In one episode, a laptop version was used, similar in function to Robocop's (probably the same software). When interrogating a suspect, the device seems to always register as 50% true. The detectives are about to throw the machine out as broken, when the woman with the suspect (not his wife) explains that they were together at the time of the crime. The machine works this time.

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** Robocop was literally a walking lie detector. He used "voice stress analysis" to make instant, near-infallible truth assessments. The one time However, it failed was when interrogating very plot-sensitive; Robo could easily use it to interrogate low-level criminals and witnesses, but the ''real'' bad guys always had ''some'' way to beat it.
**A recurring nemesis was able to make the system give null responses because he was
a city councillor, who as stone-cold sociopath.
**Once they had to interrogate
a career politician politician, which just plain ''broke'' the system. He was such an instinctive liar that every statement he made (even a baseline response such as his name) registered exactly halfway between truth and falsehood.
** In one episode, a laptop version
falsehood. He was used, similar in function able to Robocop's (probably make the same software). When interrogating system give a suspect, the device seems null response to always register as 50% true. The detectives are about to throw the machine a claim that he was ''Abraham Lincoln.'' He walks out as broken, when the woman with the suspect because a female acquaintance (not his wife) explains that they were together at the time of the crime. The machine works this time.
27th Jun '17 5:16:00 PM Austin
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* Subverted in ''Camelot 3000'', when King Arthur has each of those suspected of betraying Merlin hold Excalibur while swearing their innocence, saying that the sword can cleave truth from falsehood. The prospect of having to do this makes the culprit break down and confess, after which Arthur admits that he'd made up the claim that his sword can do any such thing.

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* Subverted in ''Camelot 3000'', ''ComicBook/{{Camelot 3000}}'', when King Arthur has each of those suspected of betraying Merlin hold Excalibur while swearing their innocence, saying that the sword can cleave truth from falsehood. The prospect of having to do this makes the culprit break down and confess, after which Arthur admits that he'd made up the claim that his sword can do any such thing.



* ''The Goblin Wood'' by Hilari Bell features an explicitly magical version of this; a bell that rings when a lie is told near it. This has its downsides, as indicated when its user is asked, "Are you sure this will work?" "Of course I'm sure--" Ding. [[spoiler:Later, her captive turns the questions around on her, and in response to her MotiveRant asks whether her ActualPacifist mother would appreciate the violent vengeance that has been taken for her murder. "If my mother was still alive, she'd be proud of me!" [[HeroicBSOD Ding]].]]

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* ''The Goblin Wood'' ''Literature/TheGoblinWood'' by Hilari Bell features an explicitly magical version of this; a bell that rings when a lie is told near it. This has its downsides, as indicated when its user is asked, "Are you sure this will work?" "Of course I'm sure--" Ding. [[spoiler:Later, her captive turns the questions around on her, and in response to her MotiveRant asks whether her ActualPacifist mother would appreciate the violent vengeance that has been taken for her murder. "If my mother was still alive, she'd be proud of me!" [[HeroicBSOD Ding]].]]



* ''The Parkers'': A lie detector watch zaps when the wearer tells a lie.

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* ''The Parkers'': ''Series/TheParkers'': A lie detector watch zaps when the wearer tells a lie.



* Also used in Great Britain by Jeremy Kyle on his lowest-common-denominator confrontation show and treated as if it had God-like infallibility.

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* Also used in Great Britain by Jeremy Kyle on his lowest-common-denominator [[Series/TheJeremyKyleShow confrontation show show]] and treated as if it had God-like infallibility.



* There's a short adventure from an early ''Dungeon'' magazine, in which an elf suspected of murder steals a magical lie-detecting sword and flees before it can be used in his trial. [[spoiler: He's innocent, but knew that the sword also detected ''elves'', and was afraid its use to test his statements would ensure his wrongful conviction.]]

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* There's a short adventure from an early ''Dungeon'' ''Magazine/{{Dungeon}}'' magazine, in which an elf suspected of murder steals a magical lie-detecting sword and flees before it can be used in his trial. [[spoiler: He's innocent, but knew that the sword also detected ''elves'', and was afraid its use to test his statements would ensure his wrongful conviction.]]
4th Jun '17 8:15:33 AM StFan
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[[quoteright:350:[[MeetTheParents http://static.tvtropes.org/pmwiki/pub/images/meettheparents_lie_detector.jpg]]]]

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[[quoteright:350:[[MeetTheParents [[quoteright:350:[[Film/MeetTheParents http://static.tvtropes.org/pmwiki/pub/images/meettheparents_lie_detector.jpg]]]]



Interesting note: The polygraph was invented by William Moulton Marston, who also created the character of WonderWoman... who happens to wield a magic lasso that ''forces'' people to tell her the truth!

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Interesting note: The polygraph was invented by William Moulton Marston, who also created the character of WonderWoman...Franchise/WonderWoman... who happens to wield a magic lasso that ''forces'' people to tell her the truth!






--> '''Operator:''' Is is true that Optik TV has the most HD channels?
--> '''Danny:''' Yup.
--> ''[ding!]''
--> '''Operator:''' I've seen you on TV. Do you work out?
--> '''Danny:''' I hit the gym.
--> ''[buzzer]''
--> '''Danny:''' I do!
--> ''[buzzer]''
--> '''Operator:''' Uh huh.

to:

--> '''Operator:''' -->'''Operator:''' Is is true that Optik TV has the most HD channels?
-->
channels?\\
'''Danny:''' Yup.
--> ''[ding!]''
-->
Yup.\\
''[ding!]''\\
'''Operator:''' I've seen you on TV. Do you work out?
-->
out?\\
'''Danny:''' I hit the gym.
--> ''[buzzer]''
-->
gym.\\
''[buzzer]''\\
'''Danny:''' I do!
--> ''[buzzer]''
-->
do!\\
''[buzzer]''\\
'''Operator:''' Uh huh.



* Lie detectors in ''ComicBook/JudgeDredd'' function on the basis of red and green lights, though they can apparently still be fooled, for instance by messing with the signal.
** Two spinoffs have shown undercover judges able to beat it. [[ComicBook/LowLife Aimee Nixon]] is a natural ConsummateLiar and, as a result, her tests always give a true result no matter [[RefugeInAudacity how ridiculous her lies are]]. [[ComicBook/TheSimpingDetective Jack Point]], on the other hand, has developed a technique where he rewrites the questions mentally so his answers aree [[ExactWords technically true]] and register as such on the birdie. For example, when asked if he has drank alcohol, he takes it to mean pure alcohol and not whiskey. He notes that it's a pretty exhausting process.
* Franchise/{{Superman}} once encountered an inquisitive college professor who began to suspect that one of his students was Superboy and started asking everyone if they were him as a demonstration for the workings of a lie detector. Superman avoided detection by realising he was no longer a "boy".

to:

* Lie detectors in ''ComicBook/JudgeDredd'' function on the basis of red and green lights, though they can apparently still be fooled, for instance by messing with the signal.
**
signal. Two spinoffs have shown undercover judges able to beat it. [[ComicBook/LowLife Aimee Nixon]] is a natural ConsummateLiar and, as a result, her tests always give a true result no matter [[RefugeInAudacity how ridiculous her lies are]]. [[ComicBook/TheSimpingDetective Jack Point]], on the other hand, has developed a technique where he rewrites the questions mentally so his answers aree [[ExactWords technically true]] and register as such on the birdie. For example, when asked if he has drank alcohol, he takes it to mean pure alcohol and not whiskey. He notes that it's a pretty exhausting process.
* Franchise/{{Superman}} once encountered an inquisitive college professor who began to suspect that one of his students was Superboy and started asking everyone if they were him as a demonstration for the workings of a lie detector. Superman avoided detection by realising realizing he was no longer a "boy".



[[folder:Fanfic]]
* ''Fanfic/DungeonKeeperAmi'': Ami tried to used her Mercury Computer as one, in [[https://forums.sufficientvelocity.com/threads/dungeon-keeper-ami-sailor-moon-dungeon-keeper.31639/page-136#post-8635931 Adamantine]]:
-->She paused to focus all of her computer's sensors on the trapped dwarf. She didnít want to miss any sign he was lying when he answered her next question. [...]\\
The readings on her screen indicated that the padding of the Dukeís armour kept him warm under the ice, and there was no shivering to obscure his bodyís involuntary reactions. There were no indications that he had been less than truthful, either. [...]\\
this being her first attempt at using her computer as a lie detector[.]

to:

[[folder:Fanfic]]
[[folder:Comic Strips]]
* ''Fanfic/DungeonKeeperAmi'': Ami tried to ''ComicStrip/DickTracy'' had a classic scene where an actual lie detector was used her Mercury Computer as one, for a great trick in [[https://forums.sufficientvelocity.com/threads/dungeon-keeper-ami-sailor-moon-dungeon-keeper.31639/page-136#post-8635931 Adamantine]]:
-->She paused
The Blank story. Tracy has a criminal in custody who apparently knows who The Blank is, but he will not cooperate. So, Tracy convinces him to focus all of her computer's sensors on take an optional lie detector test and then asks him to look over some mug shots to indicate which one is The Blank. Sure enough, the trapped dwarf. She didnít want criminal demands to miss any sign be disconnected from the lie detector, only to be told by Tracy that by doing that he was lying when he answered her next question. [...]\\
The readings on her screen indicated
just revealed that the padding real identity of The Blank has a criminal record, a vital clue to work with.
* A recurring theme in ''ComicStrip/SlylockFox'' is an apparently infallible lie detector which detects
the Dukeís armour kept him warm under the ice, and there was no shivering to obscure his bodyís involuntary reactions. There were no indications that he had been less actual truth of a statement rather than truthful, either. [...]\\
this being her first attempt at using her computer as a lie detector[.]
intent to deceive, leaving Slylock (and the reader) to explain how the criminals have used ExactWords to get round it.



[[folder:Films -- Animated]]
* ''WesternAnimation/TheLegoMovie'': In a deleted scene, Wyldstyle is captured and wired up to a lie detector. As control questions, she is asked "Is your name Wyldstyle?" and "Do you love Batman?" She says yes to both. [[spoiler: Her real name is Lucy, and she is transferring her affections to Emmet.]]

to:

[[folder:Films -- Animated]]
[[folder:Fan Works]]
* ''WesternAnimation/TheLegoMovie'': In a deleted scene, Wyldstyle is captured ''Fanfic/DungeonKeeperAmi'': Ami tried to used her Mercury Computer as one, in [[https://forums.sufficientvelocity.com/threads/dungeon-keeper-ami-sailor-moon-dungeon-keeper.31639/page-136#post-8635931 "Adamantine"]]:
-->She paused to focus all of her computer's sensors on the trapped dwarf. She didn't want to miss any sign he was lying when he answered her next question. [...]\\
The readings on her screen indicated that the padding of the Duke's armour kept him warm under the ice,
and wired up there was no shivering to obscure his body's involuntary reactions. There were no indications that he had been less than truthful, either. [...]\\
this being her first attempt at using her computer as
a lie detector. As control questions, she is asked "Is your name Wyldstyle?" and "Do you love Batman?" She says yes to both. [[spoiler: Her real name is Lucy, and she is transferring her affections to Emmet.]]detector[.]



[[folder:Films -- Animation]]
* ''WesternAnimation/TheLegoMovie'': In a deleted scene, Wyldstyle is captured and wired up to a lie detector. As control questions, she is asked "Is your name Wyldstyle?" and "Do you love Batman?" She says yes to both. [[spoiler:Her real name is Lucy, and she is transferring her affections to Emmet.]]
[[/folder]]



* In one of the ''Film/OceansEleven'' films, the team nerd has to pass a polygraph test as part of a scam, and spoofs the system by keeping a thumbtack in his shoe and pressing his foot down on it while answering the calibration questions. Later in the same movie, the sophisticated computer systems can tell if a person was cheating at the games by reading various body signals. It is fooled when the rigged slot machine gives off the giant jackpot to a random woman who didn't know about the con.
** The first example even has the person administering the test point out that, if he didn't have the machine, he would've sworn that Livingston was lying. But the machine passes him.

to:

* In one of the ''Film/OceansEleven'' films, the team nerd has to pass a polygraph test as part of a scam, and spoofs the system by keeping a thumbtack in his shoe and pressing his foot down on it while answering the calibration questions. Later in the same movie, the sophisticated computer systems can tell if a person was cheating at the games by reading various body signals. It is fooled when the rigged slot machine gives off the giant jackpot to a random woman who didn't know about the con.
**
con. The first example even has the person administering the test point out that, if he didn't have the machine, he would've sworn that Livingston was lying. But the machine passes him.



[[folder:Live Action TV]]

to:

[[folder:Live Action [[folder:Live-Action TV]]



** A strange alien lie detector appears on several episodes, which is somehow capable not only of discerning when the person is telling a lie, but also when they're lying ''even if their conscious mind thinks they're telling the truth''. Also, the comedic take was subverted in an early season 10 episode, where the tester is tortured:
-->'''Tester''': "By the way, I must say you're looking excellent today."
-->'''Vala''': Thanks, you look excellent yourself- [needle ticks rapidly] -I mean, very nice- [needle ticks rapidly] -that is, not objectionable- [needle ticks rapidly]...
** However, the Za'tarc detector only detects concealment, not the subject being concealed. This distinction becomes important when Jack and Sam come under suspicion because they trigger the Za'tarc detector. It's not because they've been compromised, but because they're trying to conceal that they care about each other "way more than they should".
** The operating principle of the Za'tarc detector assumes that (as was once widely believed in real life, but now has fairly little support) the human mind secretly keeps an accurate "recording" of everything it experiences, and therefore even an unknowing lie (and even, one supposes, an honest mistake) can be detected by comparing what is said to the infallible mental record. The device is related to the MentalPictureProjector technology sometimes seen in the series.

to:

** A strange alien lie detector lie-detector appears on several episodes, which is somehow capable not only of discerning when the person is telling a lie, but also when they're lying ''even if their conscious mind thinks they're telling the truth''. Also, the comedic take was subverted in an early season 10 episode, where the tester is tortured:
-->'''Tester''': "By the way, I must say you're looking excellent today."
-->'''Vala''': Thanks, you look excellent yourself- [needle ticks rapidly] -I mean, very nice- [needle ticks rapidly] -that is, not objectionable- [needle ticks rapidly]...
**
However, the Za'tarc detector only detects concealment, not the subject being concealed. This distinction becomes important when Jack and Sam come under suspicion because they trigger the Za'tarc detector. It's not because they've been compromised, but because they're trying to conceal that they care about each other "way more than they should".
**
should". The operating principle of the Za'tarc detector assumes that (as was once widely believed in real life, but now has fairly little support) the human mind secretly keeps an accurate "recording" of everything it experiences, and therefore even an unknowing lie (and even, one supposes, an honest mistake) can be detected by comparing what is said to the infallible mental record. The device is related to the MentalPictureProjector technology sometimes seen in the series.series.
** Also, the comedic take was subverted in an early season 10 episode with an ordinary lie detector, where the tester is tortured:
--->'''Tester:''' By the way, I must say you're looking excellent today.\\
'''Vala:''' Thanks, you look excellent yourself... ''[needle ticks rapidly]'' I mean, very nice... ''[needle ticks rapidly]'' That is, not objectionable... ''[needle ticks rapidly]''...



** Also used in Great Britain by Jeremy Kyle on his lowest-common-denominator confrontation show and treated as if it had God-like infallibility.

to:

** * Also used in Great Britain by Jeremy Kyle on his lowest-common-denominator confrontation show and treated as if it had God-like infallibility.



* In the ''Series/MurdochMysteries'' episodes "Still Waters" and "Invention Convention", Murdoch has a device of his own invention called a pneumograph, which as the name suggests, measures the suspect's breathing. Instead of the lights, his machine has blue liquid that rises in a spiral-shaped tube. Despite not having any of the other measurements of a polygraph, it appears to be nearly infallible ... providing Murdoch is asking the right questions. Murdoch himself is the subject when he first demonstrates it for his colleagues, a demonstration very much PlayedForLaughs. Of course Dr. Ogden walks in, and the questions get very personal, and Murdoch is embarrassed by the accuracy of his own invention.
* In ''Series/WhiteCollar'' (season 2, ep 6), Neal confounds a polygraph by pressing a tack into his finger during sensitive questions.

to:

* In the ''Series/MurdochMysteries'' episodes "Still Waters" and "Invention Convention", Murdoch has a device of his own invention called a pneumograph, which as the name suggests, measures the suspect's breathing. Instead of the lights, his machine has blue liquid that rises in a spiral-shaped tube. Despite not having any of the other measurements of a polygraph, it appears to be nearly infallible ...infallible... providing Murdoch is asking the right questions. Murdoch himself is the subject when he first demonstrates it for his colleagues, a demonstration very much PlayedForLaughs. Of course Dr. Ogden walks in, and the questions get very personal, and Murdoch is embarrassed by the accuracy of his own invention.
* In ''Series/WhiteCollar'' (season ''Series/WhiteCollar'':
** In season
2, ep 6), episode 6, Neal confounds a polygraph by pressing a tack into his finger during sensitive questions.



* On Series/{{ER}}, after Doug tells him he has reconciled with Carol, best friend Mark teasingly asks him if she makes him submit to this as a condition (Doug cheated on her left and right the first time they dated).

to:

* On Series/{{ER}}, ''Series/{{ER}}'', after Doug tells him he has reconciled with Carol, best friend Mark teasingly asks him if she makes him submit to this as a condition (Doug cheated on her left and right the first time they dated).



* ''Series/PersonOfInterest''.

to:

* ''Series/PersonOfInterest''.''Series/PersonOfInterest'':



[[folder:Newspaper Comics]]
* ''ComicStrip/DickTracy'' had a classic scene where an actual lie detector was used for a great trick in The Blank story. Tracy has a criminal in custody who apparently knows who The Blank is, but he will not cooperate. So, Tracy convinces him to take an optional lie detector test and then asks him to look over some mug shots to indicate which one is The Blank. Sure enough, the criminal demands to be disconnected from the lie detector, only to be told by Tracy that by doing that he just revealed that the real identity of The Blank has a criminal record, a vital clue to work with.
* A recurring theme in ''ComicStrip/SlylockFox'' is an apparently infallible lie detector which detects the actual truth of a statement rather than intent to deceive, leaving Slylock (and the reader) to explain how the criminals have used ExactWords to get round it.

to:

[[folder:Newspaper Comics]]
[[folder:Pro Wrestling]]
* ''ComicStrip/DickTracy'' had In 2003, Wrestling/VinceMcMahon suspected that [[CharlieBrownFromOuttaTown Mr. America]] was Wrestling/HulkHogan in disguise (he was) and forced him to take a classic scene where an actual lie detector was used for a great trick in The Blank story. Tracy has a criminal in custody who apparently knows who The Blank is, but test. Mr. American passed when he will not cooperate. So, Tracy convinces him to take an optional lie detector said he wasn't Hogan. Angry, Vince took the test and then asks him to look over some mug shots to indicate which one is The Blank. Sure enough, the criminal demands to be disconnected from the lie detector, prove it was rigged, only to be told by Tracy that by doing that he just revealed that for the real identity of The Blank has a criminal record, a vital clue machine to work with.
* A recurring theme in ''ComicStrip/SlylockFox'' is
buzz when he said things like he wasn't an apparently infallible lie detector which detects the actual truth of asshole, wasn't a statement rather than intent to deceive, leaving Slylock (and the reader) to explain how the criminals have used ExactWords to get round it.pervert, etc.



[[folder:Professional Wrestling]]
* In 2003, Wrestling/VinceMcMahon suspected that [[CharlieBrownFromOuttaTown Mr. America]] was Wrestling/HulkHogan in disguise (he was) and forced him to take a lie detector test. Mr. American passed when he said he wasn't Hogan. Angry, Vince took the test to prove it was rigged, only for the machine to buzz when he said things like he wasn't an asshole, wasn't a pervert, etc.
[[/folder]]



* The Magatama in the ''VisualNovel/PhoenixWrightAceAttorney'' series sort of works like this. Whenever Phoenix encounters a person that is either lying or is hiding a secret, the Magatama shows chains and locks over the person in question. The more locks there are, the harder it is to crack the person into spilling the beans.
** In one notable case, [[spoiler: this system is fooled by Phoenix's own client, who actually ''is'' the killer for once. He had the victim taken out by a hired killer, so when asked "did you kill him", he just says "no". Normally the Magatama sees through ExactWords of that sort by detecting the associated guilt, but it's implied that he's TheSociopath to the point that he didn't ''have'' any guilt over it.]]

to:

* The Magatama in the ''VisualNovel/PhoenixWrightAceAttorney'' series sort of works like this. Whenever Phoenix encounters a person that is either lying or is hiding a secret, the Magatama shows chains and locks over the person in question. The more locks there are, the harder it is to crack the person into spilling the beans.
**
beans. In one notable case, [[spoiler: this [[spoiler:this system is fooled by Phoenix's own client, who actually ''is'' the killer for once. He had the victim taken out by a hired killer, so when asked "did you kill him", he just says "no". Normally the Magatama sees through ExactWords of that sort by detecting the associated guilt, but it's implied that he's TheSociopath to the point that he didn't ''have'' any guilt over it.]]



* In ''{{Literature/Worm}}'', [[GadgeteerGenius Armsmaster]] creates a lie detector that actually works. It's later used by Legend as well.
* Grandmaster in ''{{Literature/Enter the Farside}}'' can have his helmet customised to include one of these. It can also pick on responses and relay back their tells and ticks. In [[https://enterthefarside.wordpress.com/category/arc-2-beginnings/2-3/ Beginnings 2-3]], Shaun believes Artifex used one of these on him.
* [[Wiki/SCPFoundation SCP]]-[[http://www.scp-wiki.net/scp-2128 2128]] is a stone furnace used as a torture device by a medieval cult. Whenever someone in the oven tells a lie, the SCP [[KillItWithFire incinerates]] them. This happens even for things the person doesn't know the truth of, and it has ways of avoiding [[LogicBomb paradoxes]]. [[spoiler: It's sentient, loves to eat human flesh, and isn't above roasting a truthful person.]]

to:

* In ''{{Literature/Worm}}'', ''Literature/{{Worm}}'', [[GadgeteerGenius Armsmaster]] creates a lie detector that actually works. It's later used by Legend as well.
* Grandmaster in ''{{Literature/Enter the Farside}}'' ''Literature/EnterTheFarside'' can have his helmet customised to include one of these. It can also pick on responses and relay back their tells and ticks. In [[https://enterthefarside.wordpress.com/category/arc-2-beginnings/2-3/ Beginnings 2-3]], Shaun believes Artifex used one of these on him.
* [[Wiki/SCPFoundation SCP]]-[[http://www.''Wiki/SCPFoundation'': [[http://www.scp-wiki.net/scp-2128 2128]] SCP-2128]] is a stone furnace used as a torture device by a medieval cult. Whenever someone in the oven tells a lie, the SCP [[KillItWithFire incinerates]] them. This happens even for things the person doesn't know the truth of, and it has ways of avoiding [[LogicBomb paradoxes]]. [[spoiler: It's sentient, loves to eat human flesh, and isn't above roasting a truthful person.]]



--->'''Tester:''' It checks out. Okay, sir, you're free to go.
--->'''Moe:''' Good, 'cause I got a hot date tonight. ''[buzz]'' A date. ''[buzz]'' Dinner with friends. ''[buzz]'' Dinner alone. ''[buzz]'' Watching TV alone. ''[buzz]'' Alright! I'm gonna sit at home and ogle the ladies in the Victoria's Secret catalog. ''[buzz]'' ...Sears catalog. ''[ding]'' Now would you unhook this already please? I don't deserve this kind of shampy treatment! ''[buzz]''

to:

--->'''Tester:''' It checks out. Okay, sir, you're free to go.
--->'''Moe:'''
go.\\
'''Moe:'''
Good, 'cause I got a hot date tonight. ''[buzz]'' A date. ''[buzz]'' Dinner with friends. ''[buzz]'' Dinner alone. ''[buzz]'' Watching TV alone. ''[buzz]'' Alright! I'm gonna sit at home and ogle the ladies in the Victoria's Secret catalog. ''[buzz]'' ...Sears catalog. ''[ding]'' Now would you unhook this already please? I don't deserve this kind of shampy treatment! ''[buzz]''



* The Disney Disney/ThreeLittlePigs short ''The Practical Pig'' (1939) features a lie detector, which notably goes off on Practical when, while punishing his brothers, he proclaims "This hurts me more than it hurts you!"
* ''WesternAnimation/BeavisAndButthead'' were forced to take a lie detector test after being suspected of taking money from the Burger World cash register. Before they took the test, Butt-Head told Beavis that they can trick the lie detector by holding their breath. When Butt-Head steps up, the lie detector buzzes when he claims that he understands how the lie detector works but dings when he gets the number of fingers the man holds up wrong; when asked if he ever stole anything in his life, he passed out before he could answer. When it was Beavis' turn, he successfully convinced them that he was a serial killer from the 1960s, and he didn't even hold his breath yet.
* In the ''WesternAnimation/{{Futurama}}'' episode "A Head in the Polls", Nixon's head is put under a "truthoscope" during the presidential debate. Cue flop sweat when he's asked whether he'd take candy from a small child.
--> Uhh... well, the question is vague. You don't say what kind of candy, or... whether anyone is watching... In any case, I certainly wouldn't harm the child. ''(Truth-o-scope goes nuts)''

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* The Disney Disney/ThreeLittlePigs ''Disney/ThreeLittlePigs'' short ''The "The Practical Pig'' Pig" (1939) features a lie detector, which notably goes off on Practical when, while punishing his brothers, he proclaims "This hurts me more than it hurts you!"
* ''WesternAnimation/BeavisAndButthead'' ''WesternAnimation/BeavisAndButtHead'' were forced to take a lie detector test after being suspected of taking money from the Burger World cash register. Before they took the test, Butt-Head told Beavis that they can trick the lie detector by holding their breath. When Butt-Head steps up, the lie detector buzzes when he claims that he understands how the lie detector works but dings when he gets the number of fingers the man holds up wrong; when asked if he ever stole anything in his life, he passed out before he could answer. When it was Beavis' Beavis's turn, he successfully convinced them that he was a serial killer from the 1960s, and he didn't even hold his breath yet.
* In the ''WesternAnimation/{{Futurama}}'' episode "A Head in the Polls", Nixon's head is put under a "truthoscope" "truth-o-scope" during the presidential debate. Cue flop sweat when he's asked whether he'd take candy from a small child.
--> -->'''Nixon's Head:''' Uhh... well, the question is vague. You don't say what kind of candy, or... whether anyone is watching... In any case, I certainly wouldn't harm the child. ''(Truth-o-scope ''[truth-o-scope goes nuts)''nuts]''



3rd Jun '17 9:54:41 PM Eddy1215
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* ''Series/FamilyMatters'': Steve's lie detector has the added feature of giving Carl an electric shock if he doesn't tell the truth.

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* ''Series/FamilyMatters'': Steve's lie detector has the added feature of giving Carl an electric shock if he doesn't tell the truth. After Carl and Steve work out the issue they were having, Harriet decides to take the opportunity to ask Carl how many women he was serious about before her, resulting in him being continuously shocked.



* ''Series/GilligansIsland'': The Professor builds a lie detector out of -- what else? -- [[BambooTechnology bamboo and coconuts]] and tests all the men to find out who sent Mrs. Howell a love letter. One of the gags is The Skipper passing until he says, "See? I always tell the truth," which sets it off.

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* ''Series/GilligansIsland'': The Professor builds a lie detector out of -- what else? -- [[BambooTechnology bamboo and coconuts]] and tests all the men to find out who sent Mrs. Howell a love letter. One of the gags is The Skipper passing until he says, "See? I always tell the truth," which sets it off. At the end of the episode, Gilligan is messing with it when Mary Ann comes in asking him what happened to a coconut cream pie she made, and Gilligan denies seeing or taking it, [[ExplosiveInstrumentation which causes the lie detector to explode]].
-->'''Gilligan''': Well, it was delicious, anyway.
3rd Jun '17 9:43:01 PM Eddy1215
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--> she paused to focus all of her computer's sensors on the trapped dwarf. She didnít want to miss any sign he was lying when he answered her next question. [...]\\

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--> she -->She paused to focus all of her computer's sensors on the trapped dwarf. She didnít want to miss any sign he was lying when he answered her next question. [...]\\
3rd Jun '17 9:01:02 PM Malady
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Added DiffLines:

[[folder:Fanfic]]
* ''Fanfic/DungeonKeeperAmi'': Ami tried to used her Mercury Computer as one, in [[https://forums.sufficientvelocity.com/threads/dungeon-keeper-ami-sailor-moon-dungeon-keeper.31639/page-136#post-8635931 Adamantine]]:
--> she paused to focus all of her computer's sensors on the trapped dwarf. She didnít want to miss any sign he was lying when he answered her next question. [...]\\
The readings on her screen indicated that the padding of the Dukeís armour kept him warm under the ice, and there was no shivering to obscure his bodyís involuntary reactions. There were no indications that he had been less than truthful, either. [...]\\
this being her first attempt at using her computer as a lie detector[.]
[[/folder]]
31st May '17 7:05:00 PM PaulA
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* In one of the Hitchhiker's Guide to the Galaxy books a witness is forced to tell the "whole truth" after being given too much truth serum. Sure enough, he begins spouting facts about everything the universe has to offer. It takes him several years.

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* In one of the Hitchhiker's Guide to the Galaxy books ''Literature/LifeTheUniverseAndEverything'', a witness is forced to tell the "whole truth" after being given too much truth serum. Sure enough, he begins spouting facts about everything the universe has to offer. It takes him several years.
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http://tvtropes.org/pmwiki/article_history.php?article=Main.LieDetector