History Main / LieDetector

19th Jan '18 1:11:30 PM Bergamot
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* In ''[[Literature/LandOfOz The Marvellous Land of Oz]]'', Glenda the Good possesses a magical white pearl that turns black in the presence of falsehood, which she uses to extract a confession from the witch Mombi.
6th Jan '18 9:57:42 PM Eddy1215
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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]].

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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. [[BrickJoke At the end of the episode, 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]].
6th Jan '18 11:11:18 AM dalek955
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* In ''Literature/TheLostFleet'', interrogation rooms are actually brain scanners similar to an fMRI. The machine shows the interrogator when regions of the subject's brain associated with deception or various other emotions light up, so not only do they know when the subject lies, but they can also tell when [[ArmorPiercingQuestion one of their questions has really hit home]], even if the subject is refusing to answer at all. There are ways to deceive without setting off the machine, but those usually involve WeaselWords that a skilled interrogator can spot. Of course, the machine can still only tell you what the subject believes, so false answers with no deception noted are still possible from a dupe or a delusional subject.
28th Dec '17 8:46:53 AM JackG
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* ''Series/StarTrekVoyager''. In "[[Recap/StarTrekVoyagerS1E7ExPostFacto Ex Post Facto]]", Tuvok uses an "Autonomic Response Analysis" to interrogate Tom Paris. It shows that he's telling the truth about not committing a murder, [[FrameUp which turns out to be true]]. However in "[[Recap/StarTrekVoyagerS2E26S3E1Basics Basics, Part One]]", Chakotay requests the Doctor do an ARA to see if an alien prisoner is lying. The Doctor points out that they don't have enough baseline information on that species to give an accurate result.

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* ''Series/StarTrekVoyager''. In "[[Recap/StarTrekVoyagerS1E7ExPostFacto Ex Post Facto]]", Tuvok uses an "Autonomic Autonomic Response Analysis" Analysis to interrogate Tom Paris. It shows that he's telling the truth about not committing a murder, [[FrameUp the murder he's accused of, which turns out to be true]].a FrameUp. However in "[[Recap/StarTrekVoyagerS2E26S3E1Basics Basics, Part One]]", Chakotay requests the Doctor do an ARA to see if an alien prisoner is lying. The Doctor points out that they don't have enough baseline information on that species to give an accurate result.
28th Dec '17 8:45:25 AM JackG
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* ''Series/StarTrekVoyager''. Chakotay requests the Doctor do an "Autonomic Response Analysis" to see if an alien prisoner is lying. The Doctor points out that they don't have enough baseline information on that species to give an accurate result.

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* ''Series/StarTrekVoyager''. Chakotay requests the Doctor do In "[[Recap/StarTrekVoyagerS1E7ExPostFacto Ex Post Facto]]", Tuvok uses an "Autonomic Response Analysis" to interrogate Tom Paris. It shows that he's telling the truth about not committing a murder, [[FrameUp which turns out to be true]]. However in "[[Recap/StarTrekVoyagerS2E26S3E1Basics Basics, Part One]]", Chakotay requests the Doctor do an ARA to see if an alien prisoner is lying. The Doctor points out that they don't have enough baseline information on that species to give an accurate result.
16th Dec '17 2:29:14 PM DaibhidC
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* Subverted as early as 1913, in the ''Literature/FatherBrown'' story "The Mistake of the Machine". Father Brown is introduced to a Psychometric Machine that measures the suspect's pulse, and is rather scathing of the idea, saying American scientists must be great sentimentalists to try and prove things from heart-throbs. He proves his point when a man is accused of murder based on his pulse rate when the victim's name is mentioned, and Father Brown is able to demonstrate another reason for this.
-->'''Greywood Usher''': Now, in my opinion, that machine can't lie.
-->'''Father Brown''': No machine can lie. Nor can it tell the truth.
10th Dec '17 12:18:54 AM JackG
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* ''Series/BlakesSeven''. In "Dawn of the Gods", our heroes are able to beat this through ExactWords. The Calip is seeking Orac, not realising it's a MasterComputer.

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* ''Series/BlakesSeven''. In "Dawn of the Gods", our heroes are able to beat this through ExactWords. The Calip Caliph is seeking Orac, not realising it's actually a MasterComputer.
10th Dec '17 12:18:15 AM JackG
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* An advert for antiperspirant had a FemmeFataleSpy being testing, but she passed the 'galvanic skin response' thanks to the product.

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* An advert for antiperspirant had a FemmeFataleSpy being testing, tested, but she passed the 'galvanic skin response' thanks to the product.


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* ''Series/BlakesSeven''. In "Dawn of the Gods", our heroes are able to beat this through ExactWords. The Calip is seeking Orac, not realising it's a MasterComputer.
-->'''Caliph:''' The [[AgonyBeam neuronic whip]] is on an automatic setting. It has only to sense one lie and it will boil your brains in your skull. Where is Orac?
-->'''Tarrant:''' If he's not on the ship, I don't know where he is.
-->'''Caliph:''' How tall is he? ''(Tarrant demonstrates)'' A dwarf?
-->'''Tarrant:''' We never think of him as one.
-->'''Caliph:''' What is the color of his hair?
-->'''Tarrant:''' He hasn't got any. A bald dwarf shouldn't be too hard to find.
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.

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* {{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]].
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http://tvtropes.org/pmwiki/article_history.php?article=Main.LieDetector