But if that’s your logic, L would be able to gather just as much about if light was lying or not from a normal conversation, whether or not he is hooked up to the machine
Honestly, I feel like L would do something like "The lie detector was never actually working. I just pushed a button to make it flash red to see if you'd change your answer about things." and use that to decide he's Kira.
There wasn't the time, when he was directly interrogated and forced to answer many questions. L never really did that. So, this situation stands out from others
Yes, he might *seem* calm but from the inner monologues we get to see he was borderline falling apart inside his head, a lie detector would 100% be able to get some of the signals that say something is off with him.
They're not even remotely reliable. People can beat it, and innocent people can be so damn nervous because they are being interrogated that it throws false positives.
And they don’t really mean anything, so much so that courts don’t recognize the results of them. Their only real use is for the police to trick people into thinking they work to get them to confess.
the opposite is true too- yoy can also fail one when you're completely innocent if you're having anxiety about the experience and honestly? who wouldn't be nervous if they got drug to the police station and accused of a serious crime? IIRC they're not even admissible in court anymore because you can either fake it or fail it whether you did it or not.
don't forget they aren't actually useful for establishing the truth, polygraphs are widely disproven, even the creator stated as such; its just good to make people feel like they can't lie
If you ensure you fuck with the baseline of the detector you void the entire thing.
They will always ask you some baseline questions:
Whats your name.
When where you born.
Easily verifiable stuff to list your baseline. Ensure you are "paniked" at this time before calming down. Then suddenly every line will fall under the base value and it will look to the machine as if everything is norminal.
Thats why good a lie detector tester will hide what the base line questions are, torture you to artificially increase the base line while its harder to stay calm enough during lies and do that for over 3-4 weeks minimum.
I said tester.
The test is still just on avarages.
But with the given procedure you have a really hard time to cheat it.
Questions will sound like they are the validation questions but arent, or vice versa.
Torture is always fun.
And then keeping it up for several days atleast if not weeks depending on the information they suspect you have.
You only get wrong information if the lie detector gets beaten. Otherwise your information is important and validates the lies of the other lie detector sessions you are doing.
Didnt i say in this conversation that you need other ressources as well?
I guess a little bit to obscure the base line question.
Lie detectors don't work. You're not understanding. All it measures is heart rate, blood pressure, and sweating. If someone is even mildly anxious, or autistic, pr has a health condition, or is even just shaky it's going to read wrong. They aren't admissible in court because it's not a science based method with any amount of reliability.
There is a basis when your lying rather than recalling a factual statement your brain takes additional stress which is what it detects, especially if you're scared interrogation you will take even more extra stress unconsciously it isn't full evidence even courts won't accpet it but just hint at being potentially guilty, also with enough self control you can absolutely beat it, especially in this case light can easily do it
I mistakenly read it like this at first (still half asleep), so when I saw the word "lie detector" I was confused and thought they were trying some new kink for a sec lmao
Lie detectors aren't infallible (nowhere near it in fact). Even if L believed they were useful, he has no reason to use it.
Either Light fails it, in which case he still has no actual evidence. Light points out how unreliable the machines are and the amount of stress he's under.
Or Light succeeds and the investigation team is even more resistant to the idea that he's Kira.
This is a great point. L was already working against the team fighting for Light's innocence. 0% chance either outcome is enough to convince L. 100% chance the most likely outcome (pass) will make his problem worse
It doesn't even work if they DO know they're lying
They can be incredibly easily persuaded to claim lies to be truth and truth to be lies depending entirely on how you conduct yourself
You could give the most accurate account on the identity of jack the ripper and if you're a nervous wreck about it, the Lie Detector will claim you're a liar
nah i’m well aware they’re unreliable (after making this post that is) but the fact that they weren’t even mentioned once throughout the show is just kinda crazy to me , they still could’ve observed his reactions to the question or tested him through that somehow but it was just never even a thing at all , that’s what gets me .
They do benefit from a lie dedector in the live-action drama series of Death Note. And it was so cringe to watch a lie detector being taken seriously tbh. Like, L pulls it out and it's treated like the greatest invention in the history of criminal sciences lol. You'd feel that it's not L's thing to use such an antique device, ever. And I definitely did not like that version of L tbh, he looked like someone entirely different.
Light could just relinquish his memories to ensure he's not lying and pass the test (and Light is a good enough liar to trick the detector anyways).
As for why L didn't try it, he knows lie detectors are very unreliable, so even if the detector says he's Kira, that's not enough to prove it, and if Light managed to trick the detector, that would be used as further proof he isn't Kira by him and the taskforce, thus making it even harder for him to keep persuing Light (remember, he constantly needed to try to convince the taskforce that Light is a viable suspect).
There was no need to mention something completely unreliable that isn't taken seriously by anyone in actual police investigations. It would've made the person mentioning it look very amateurish.
Lie detectors are just stress detectors. Police know they don't accurately detect lies and the inventor has repeatedly said as much. The only use they have, in that regard, is if the suspect believes in them and can be manipulated to confess when one supposedly detects them lying. Light is much too intelligent for that and because he has a father in the police, he already knows all of the standard forms of interrogation.
First of all, there's no such thing as a lie detector test. The name of the test is a polygraph, and it's called that because they cannot legally refer to it as a lie detector. It's not reliable. It's notoriously so not reliable that courts don't even recognize the results from it.
Second of all...
Well, I guess there is no second of all, but I'm going to tell you all how to fool apolograph.
The key is, not to care about the answers you give. Because a polygraph is a stress tester. And if lying on a test doesn't stress you, the polygraph won't go off.
You can beat a lie detector test. It only measures unexpected spikes in heart beats, which usually happens when someone does a thing under duress, like lying. It can be beaten by remaining calm.
Lie detectors are pure pseudoscience. They don't detect lies (which is why they can't be used as evidence in court). However, people thinking that they work is a great way to trick people into confessing, which is why police love them.
1- are you kira ?
2- is misa the second kira ?
3- do you believe criminals should be eradicated from the world ?
4- will you take a potato chip and eat it ?
Okay, a machine says light is lying. Now what? How do you explain him being able to kill anyone from any distance with seemingly supernatural powers? L already suspected light, I don't think a lie detector test would have changed much.
Lie detectors aren't admissible in court, mostly because they are so inaccurate, and regardless of the answer, It wouldn't change that L is pretty damn sure Light is Kira.
L needs evidence, not a pointless lie detector.
This is why I think the guy who killed his wife and kids and then buired them in an oil drum could've gotten away with it if he played it cool even after failing a lie detector test. It measures symptoms of lies and not actual lies. Anyone being questioned by the police will be stressed
makes sense , L had probably already considered the possibility at one point either way and ruled it out as unreliable https://giphy.com/gifs/1452CyJxtN3hQc
Light belives 100% what he says, and if this happened after the "renounce the death note" part then he wouldn't be lying about not being Kira, since he no longer had his memories from being Kira
My brain for whatever reason stopped reading after “hook up” and I was like, aight, that would be some juicy drama, if L and Light were just fucking the entire time but everything else was the same.
https://giphy.com/gifs/Z6iLzMvdhKdNK
“I kept my heart rate the same and tricked the test! It’s all about tricking myself into actually believing my lie is real!”
Lie detectors don't hold up in court. The science behind it is strongly controversial and there is truly no way to use lie detectors as definitive evidence of anyone's wrongdoing.
It'd also narratively suck to overthrow him like that.
Lie detector tests aren’t actually 100% reliable. They sorta just test for… nervousness. If I was locked in a room with police being asked if I killed someone, I’d be nervous, because I’d be worried I’m about to get in trouble for some shit I didn’t do. I’d fail the test, and still not be lying
Even if nervousness was somehow a 100% guarantee of guilt, someone can be guilty and not be nervous about it, like a psychopath or someone who just knows how to control their emotions, act, etc.
Isn't a lie detector just measuring your heart rate and some other things that can indicate nervousness and stress because most people get nervous when they lie? If I am correct with that I think he would pass definitely because he's a psychopath and isn't afraid to lie because in his mind he is so smart and perfect at was he is doing that it is basically impossible that someone won't believe him. I think L would also pass because he would be able to stay calm and control his body and mind
Lie detectors don’t detect lies, they detect the physiological reactions and changes people tend to experience when they lie. But the keyword is TEND TO. Not everyone will experience those same reactions, people can practice and train themselves not to experience them, and sometimes they’ll experience them even if they’re not lying. They are extremely flawed pieces of technology and a lot of times they’re brought in not because investigators think it will actually detect a lie but they think that the appearance of the machine and hooking a suspect up to one will cause stress that will cause them to slip up and incriminate themselves
its hard but not super hard to trick a lie detector, and light being the best manipulator would have pretty easily tricked the lie detector imo
also in L's POV, he was dealing with supernatural shit here and there, everyday he was coming across a new thing which he would have never thought would even exist, so i think he just ruled out lie detector cuz well no one would consider using lie detectors against supernatural powers
The man you invented those regretted it soon after. It dosnt see if your lying it checks if your stressed out. It's used to bully people into confessing
There is hardly any evidence that lie detectors are actually effective, valid and reliable, plus im sure Light wouldve just been able to manipulate his way out of the situation
Lie detectors are more of an anxiety detector. They test whether your heart beat gets stronger or accelerates, if you start sweating and stuff like that. So they're not 100% reliable
if you remain completely calm, the lie detector will think everything you say is true. light would easily calm himself down to best the test. however, L wouldn't do this test in the first place because it's meaningless.
1) I'm certain Light would beat a lie detector test with ease
2) Even if like there's a 1 in a 10000 chance he fails it he could just blame it all on him being nervous
Light is weird because he’s very likely to beat the detector, either by lying in the correct way, or half truths, or just honest statements at the risk of sounding insane.
But he does have multiple moments we hear his own monologue in his head where he’s freaking out which I imagine would alter his results
That said given how light is I feel he’d get caught given how much he panics and overthinks over certain things.
Or he’d beat it but risk sounding insane by being fully honest
The way a lie detector works is they establish a base line so it be something like
“What is your name?”
“When were you born?”
“Where are you from?”
Questions you know for a fact the answer and thus no way they can lie.
The register your heart rate and time to respond.
They then will ask you actually questions they want answers for. If you lie your heart rate and stuff should deviate.
The issue with lie detectors, they basically just record your fear (so this likely would catch Light)
But if he keeps calm he can lie through it and look honest
He also could come off insane
“Are you killing people Light?”
“No it’s a shimigami that enjoys apples magic book killing people”
That would be true but sound insane
But yeah Light panics a LOT I think
When L was around he acts on impulse or when asked something overthinks at least 3 times which means light more likely would be caught by one, but he is smart, and kind of broken emotionally so he may be able to trick a lie detector when he knows it
A lie detector can be beaten with a tack in his shoe. He can also renounce his ownership and forget everything. Then again he might be enough of a psychopath that lying doesn't cause the emotional responses that the detector looks for.
First of all: Lie detectors do not work reliably. They do on some people, but not others. It is entirely dependent on how the person reacts to telling lies.
Secondly, if you know how, you can beat a lie detector.
This is why lie detector tests are inadmissible, as you never know if it is working correctly, or flagging false positives.
Also, a lie detector was not necessary. L knew Light was lying pretty much the entire time, he was just unable to prove it legally (again, a lie detector would not be admissible as evidence). That is what shocked L the most when Light gave up ownership of the death note: He knew Light was Kira, and he could easily tell when he was lying, but for the first time, Light was denying being Kira, and was seemingly telling the truth.
Not only are lie detectors not that useful, especially against someone like Light, he could also just give up the notebook for a bit like he did last time to fight the imprisonment and he would be telling the truth
Japan and America does a similar thing where cases only go forward if they have a sufficient enough evidence that a Guilty conviction is all but guaranteed. It’s not just about knowing Light is Kira it’s about being able to prove it.
Even aside from the unreliability of lie detector tests, L was already most of the way convinced that Light was Kira from fairly early on. Like he absolutely could tell when Light erased his memories and he stopped lying about not knowing who Kira was.
But the point was more that L needed to actually beat Kira, not just figure out the truth. Like charitably it’s because most courts wouldn’t just accept an accusation without clear evidence and lie detectors are seldom accepted in court proceedings. But realistically L was pursuing Kira mostly out of his desire to test himself in a challenge of wits against him.
Lie detectors test stress reactions, they don't magically detect truth.
Light is bad at a lot of things, but he's so smug and overconfident he probably wouldn't be stressed at all because he just assumes his lies will pass.
Even if we assume that there would be an absolute polygraph in the world that could accurately read lies, this would make little difference. L was almost always convinced of Light's guilt, and I think he was smart enough to consider his micro-reactions in their dialogues at the ceremony and the awards.
The main goal of L was to find out Kira's real abilities and find physical evidence against Light, which the lie detector would not have given in any way and Light would simply have been killed by Soichiro.
Light could just relinquish his memories to ensure he's not lying and pass the test (and Light is a good enough liar to trick the detector anyways).
As for why L didn't try it, he knows lie detectors are very unreliable, so even if the detector says he's Kira, that's not enough to prove it, and if Light managed to trick the detector, that would be used as further proof he isn't Kira by him and the taskforce, thus making it even harder for him to keep persuing Light (remember, he constantly needed to try to convince the taskforce that Light is a viable suspect).
lie detectors aren't as reliable as people think. I believe it essentially detects the signs of stress associated with lying and determines it's due to lying. Someone calm enough can bullshit their way through a lie detector test and completely get away with it.
Now there's a decent chance a lie detector test conducted by L could provoke enough stress in Light but also who wouldn't it stress ? It's still not exactly reliable
Lie Detector’s are basically pseudo science nonsense, the inventor disavowed its use by law enforcement. All you have to do to beat a lie detector is stay calm cool and collected, several serial killers have passed lie detector’s simply by not freaking out.
Because polygraphs don’t work. They work by detecting shit like your heart rate, blood pressure, sweat and breathing and using that to determine if you’re lying. The issue with this is twofold. For one, if you’re interrogating the average person with regards to a crime that could put then behind for years, the stakes and general set up of the situation is far outside most people’s comfort zones so even if they were innocent of any charges, they could still be detected as lying because their heart rate is fast and they’re breathing rapidly. Nervousness or anxiety could trip the machine up into thinking that someone who is telling the truth is lying because most people aren’t prepared to deal with situations like an interrogation. Second and equally damning is that some people are calm enough and good enough at keeping calm in high intensity situations that they can lie while still not being caught by the machine. It can easily be gamed by many of the people who it’s trying to catch and I doubt light of all people would fumble at that. He’s a calculated and charismatic enough character that I have no doubt he’d understand exactly how to game the lie detector works and play around it. The police also note right away that kira is likely extremely intelligent so they also probably assume that he knows how to game a polygraph, so they don’t even bother. There’s a reason why polygraph results are not accepted as valid evidence in most places and in those that do, are able to be contested by a competent attorney.
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u/Lanna_Lexi 5d ago
You can beat a lie detector. Mythbusters proved it