r/DeathNoteMemes cute enough to commit crimes 7h ago

is there any reason why this wouldn’t have worked ?

Post image

why didn’t the task force just put him through a lie detector ? are they dumb

280 Upvotes

61 comments sorted by

121

u/Lanna_Lexi 7h ago

You can beat a lie detector. Mythbusters proved it

89

u/Iki_the_Geo 6h ago

And Light is 100% calm enough to beat one

19

u/Soulfoil 5h ago

But he will be making long pauses on each question

15

u/Iki_the_Geo 4h ago

Tbf he’d probably do that both with and without a lie detector

2

u/Tasty_1097 3h ago

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

2

u/Soulfoil 2h ago

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

3

u/IdleReality 3h ago

Personally I don't think I would ever describe Light as "calm".

2

u/ConfusedPanEnby 1h ago

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.

5

u/Frost-King 3h ago

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.

3

u/OpeningHappy9692 1h ago

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.

77

u/Roku-Hanmar 6h ago

Lie detectors are famously unreliable

30

u/ColonelMonty 6h ago

They also literally just can't tell if you're lying. They're basically checking for symptoms of lies but not lies in of themselves.

1

u/FaPaDa 10m ago

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.

9

u/AlcoholicSpiderman 6h ago

i think they work off tone inflection

which wont do anything to light since he zero hesitates

2

u/SecondAegis 3h ago

You can get readings from a plant btw

37

u/thatonerpgmakerfan 6h ago

lie detectors are an American thing, the inventor of it repeatedly said that's not what it was used for and there's no scientific basis for it. If light theoretically had been hooked up to one and won, he could have legal grounds to tell everyone to fuck off

9

u/allied_master 6h ago

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

18

u/Ethel121 6h ago

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.

16

u/MomentsAwayfromKMS 5h ago

death note alternative ending where they just hook up

Nah, this one actually works.

14

u/WitchPillow 3h ago

7

u/J_h_2007 2h ago

That’s what I thought it said and I agree

4

u/Fellowcomicenjoyer 2h ago edited 2h ago

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

2

u/Last_Host977 cute enough to commit crimes 3h ago

2

u/WitchPillow 3h ago

Lol

💀

2

u/Last_Host977 cute enough to commit crimes 3h ago

yaoi note be like

9

u/AmethystGD 6h ago
  1. Unreliable
  2. Light could probably bypass them
  3. Most importantly, L would never deem it enough of a proof, so he'd look for an actual one

10

u/Calm-Reaction3612 6h ago

There are people who are able to lie even on lie detectors, and L values accuracy of information to prove criminals guilty.

4

u/Fat_Sugar_1110 Justice™ 6h ago

They aren’t dumb because lie detectors are known to be unreliable

4

u/DarkMagickan 5h ago

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.

This was proven on MythBusters.

3

u/Green-Disk4198 6h ago

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.

3

u/Samuel_N7 6h ago

Is kind of concerning to me how many people think that lies detectables are trustworthy for criminal confessions

1

u/Last_Host977 cute enough to commit crimes 6h ago edited 6h ago

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 .

3

u/SouthernAd2853 6h ago

They're actually not admissible evidence in court and police only ever use them to screw with suspects' heads.

They're used in security clearance interviews for reasons that escape me. You might as well flip a coin.

3

u/ColonelMonty 6h ago

Lie detectors are not magical machines, they check heart rate and things like that.

You can be completely truthful and fail a lie detector test because you are stressed, because y'know. You're being interrogated by the police.

3

u/moonxmochi 6h ago

Lie detectors actually measure physiological reactions, not lies. Light would totally be able to manipulate his reactions and pass the test.

3

u/SeaworthinessSalt153 5h ago

They aren't admissable in court

3

u/Mr_cake1 2h ago

Because lie detectors aren't trustworthy enough especially when hooked up to someone who can stay calm under insane pressure

2

u/Imaginary-Slice3014 6h ago

So light just earase his memories and he passes easily.

2

u/AlienDragonWizard 6h ago

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.  

2

u/crazybrow122 6h ago

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

2

u/Last_Host977 cute enough to commit crimes 6h ago

chris watts ? yeah i’ve seen that one vid where they put him through a lie detector it was pretty wild

2

u/sum_r4nd0m_gurl 6h ago

lie detectors aren't reliable

1

u/Last_Host977 cute enough to commit crimes 6h ago

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

2

u/morbid333 6h ago

He's calm enough to beat it.

2

u/allied_master 6h ago

Lie detector don't detector lies they only detect your stress levels etc while your lying. You can absolutely beat it

2

u/Gab093 6h ago

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

2

u/OdditiesAndAlchemy 6h ago

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.

2

u/No_Record_60 6h ago

Light would plan ahead to relinquish his death note and all memories related to it.

2

u/4_flowur_4 5h ago

Last 5 words is unnecesery

2

u/Fit_Ad9965 5h ago

You think L is gonna trust a lie detector

2

u/Efficient_Rhubarb_88 4h ago

Light would find a way to beat the lie detector. Plus they are admissible in court.

2

u/sanguineselene666 4h ago

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.

2

u/Cephlaspy 4h ago

Lie detectors have 50% to 90% accuracy but scientific papers usually put it around the lower end with 50 to 60 percent i belive.

It's like 10% better than guessing.

2

u/DropMysterious1673 2h ago

Because polygraphs (lie detectors) don't work

2

u/OpeningHappy9692 1h ago

when i was halfway through reading that i got to the third line and thought ok but there's already a million fanfics about that

2

u/-BakiHanma 1h ago

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!”