detective world detective

Chapter 827 Faulty lie detector? (4000)

Although it is just a feeling, for criminals, criminal intuition is actually very important.

Although this is a mysterious and mysterious feeling, it is the feedback brought to them by the accumulation of experience.

And after watching the video, Karasawa, Officer Megure and others made the same judgment.

There must be something wrong with this guy Daida Uno.

Generally speaking, even people with no problems will feel panic and anxiety when they enter the interrogation room and face suspicion.

But the other party didn't feel this way at all, only a feeling of superiority.

It's a bit like a game player. No matter how powerful the monster in the game is, you know that it can't jump out of the screen and hurt you.

So you can play crazy and play with the characters in the game and become the "fourth natural disaster" without any scruples.

This is expressed in the other person’s demeanor, tone, and even every move.

One detail in particular made Tang Ze even more certain that there was something wrong with the other party.

When Miwako Sato opened the door to the interrogation room, Uno Daidai stretched out his hand to look at the time, and then showed a calm smile.

Then, after Officer Megure got the news about the delivery man, he told him that he could leave.

That gesture seemed to already know the answer in advance.

If he was not a prisoner, then he should not know the time of Xiaoji Xiangyu's death.

Even if he did meet the delivery man at 9:10, this should not give him confidence.

But where does this confidence come from?

This may be the key to the case.

But unfortunately, all Tangze watched was the video recording, and he did not have the opportunity to communicate with the other party to test it out.

In the video, after Officer Megure signaled that the other party could leave, Daida Uno stood up and straightened his suit.

"I learned the estimated time of death through autopsy. Sure enough, the power of science is great."

Before leaving, Daida Uno looked at everyone and said with a smile: "You people, don't always doubt others without basis.

We should make more use of the power of science so that we can find out things clearly. "

Before leaving, Daida Uno looked at the three silent people in the interrogation room and smiled smugly, then opened the door and prepared to leave.

"Wait a moment!"

After hearing what Daida Uno said, he seemed to be reminded, but Takagi on the side suddenly stopped him, "If you say so, can I delay you for a while longer?"

"What? Is there anything else?" Daida Uno stopped and turned around and asked.

"We would like to ask you to cooperate with the lie detector test." Takagi looked at Daida Uno and said solemnly: "Since you said you are not the murderer, you naturally don't feel guilty, right?"

"How to provoke generals? There is no need to use this method. If you feel at ease this way, I will cooperate with you."

Daida Uno spread his hands and said with a smile: "Anyway, I don't have any regrets. After taking the test, you won't harass me anymore, right?"

"Of course." Officer Memu said solemnly.

The video ended here, and soon Takagi came over and called up another video for him.

This video is in another room, which is specially equipped with polygraph machines. It is a newly opened department of the Metropolitan Police Department.

Soon, a staff member from the forensics department came to the room. After some exchanges with the other party, Daidai Uno was asked to put on a lie detector.

The lie detectors of this year were still very simple. The instrument was placed on a table, and one side of the sensor was then tied to the other person's chest and fingers.

As mentioned before, polygraph tests are based on breathing, blood pressure and pulse, as well as hot and cold changes in the skin.

In particular, the skin resistance indicated by the red line will change significantly.

This red line is really a red line. The current polygraph test shows fluctuations not on the electronic screen, but on the scrolling paper with drawn lines and ticks.

Of course, as simple as it is simple, the function is still the same, and the pointer can also change according to the skin resistance.

After the instrument was put on, the pre-inspection started in the video, which was the test with playing cards mentioned earlier.

In the video, Daida Uno still cooperated with the supervisors' questions and began to deny it one by one.

And when it came to whether the poker card "6" was the card he saw, and the other party answered "no", the red line that had not fluctuated before immediately began to swing up and down significantly, drawing on the white paper that kept moving forward. On the red line of violent fluctuations.

This also proves that the lie detector is not malfunctioning and can detect the lies told by the other party.

But even so, Daida Uno remained calm after the test.

After that, the forensics department staff handed over the list of questions that needed to be asked to the other party for review and confirmation.

That's right, before the formal test, the person being tested will be informed in advance of the questions that will be asked of him.

This is the "highest point of tension questioning method". The content of the question is mixed with something that only the prisoners and their criminals know.

The purpose of letting the subject know the questions that will be asked from the beginning is to prepare him mentally.

After denying the false information one by one, and when it is the turn to ask the right questions, the well-prepared subjects will unconsciously become nervous.

This is a normal physiological reaction of human beings, and most people cannot completely calm themselves down.

This is also the key to this technique.

In the video, the first question asked by the forensics officer was "Do you know the color of the clothes that Xiaoji Xiangyu was wearing on the day of the crime?"

Red, green, blue.
  After asking about the colors on the question sheet one by one, the pointer on the lie detector did not fluctuate violently until the end.

Including when asking for the correct answer "yellow", the polygraph still showed no changes.

Afterwards, the supervisors followed the question list and asked the other party whether they knew the method by which Koji Xiangyou was killed.

Choked with bare hands, strangled with a tie, strangled with a towel...

When asked about the "rope" for the correct answer, Daida Uno's answer was still "I don't know", but the lie detector showed no response at all, just like the previous answer.

"Okay."

After all the questions were asked, the forensic officer took off the polygraph and said, "Thank you for your cooperation."

"It doesn't matter. If this can save me some trouble, I'll be happy."

In the video, Daida Uno looked up at the camera and smiled: "Sure enough, the machine is reliable and will not make redundant, unreasonable, and unfounded speculations like people who are stuck in the concept."

Looking at the sarcastic look on the other party's face in the video, coupled with the mocking words, Tang Ze could already imagine what the expressions of the people watching the surveillance in the observation room were like.

But it's a pity that they can only be helpless and furious. As Daida Uno said, their speculation was based on no basis. Just because the other party had been "frivolous", they included the other party in the ranks of suspicion.

The lie detector is a machine that has no emotions or any bias.

It just records all the data faithfully and objectively, which is a more fair existence.

They even wondered if there was something wrong with the instrument, but when Takagi sat on it and tried two questions, they found that there was no error at all in the polygraph.

This is true and irrefutable.

This is true even if they are unwilling to do so.

The detection chart without any changes clearly told everyone a fact.

Daida Uno is really not a murderer. He does not know any details of the murder.

Of course, generally speaking, the failure of a polygraph is not a big deal. After all, nothing can achieve 100% accuracy.

After all, the lie detector is based on the physiological reaction of a person when he or she is lying, to determine whether the person being examined is lying.

Some people may be born with physical abnormalities that are not a big problem in other aspects, but they can evade polygraph detection.

Therefore, it is understandable if the lie detector makes a mistake.

But there is something unusual about this guy, and his suspicion is too high.

Not only the performance, but also the tie clip dropped at the crime scene was too suspicious.

Although it is true that as the other party said, it may be inevitable that his tie clip fell at the crime scene, but for the search, all accidents are inevitable!

At least they must have this attitude to eliminate every suspicious point.

As for the impact, it is also because the status of the testers this time is somewhat special.

The other party was a physicist, and under such great suspicion, he actually passed the polygraph test.

This made the people above worry.

It would be okay if the other party is indeed not the murderer. If he is the murderer, might the other party have some means to avoid the polygraph test?

If there is really a way to block polygraph testing, then the problem will be huge.

If this problem is discovered after large-scale use, countless previous cases may be wrongly convicted.

So this impact is absolutely huge and cannot be ignored.

If there is even the slightest possibility, then Tangze's decision will be cut off without mercy.

Even if the convenience is lost, at least there will be no problems with the operation of the Metropolitan Police Department.

And once it is discovered that the other party has indeed blocked the polygraph, it will prove that the "lie detector" has become a thing of the past.

The so-called science is like this. The continuous upgrading of technology will make some existing technologies obsolete.

Checks and balances and being checked and balanced have always been the case in the development of science and technology.

But Tangze felt that even if this situation might happen in the future, at least it would not be the current case.

There's definitely something wrong with that guy!

He thought that if there was no problem with the instrument, it would prove his innocence?
  It can only be said that the professional habits of scientific researchers make him a bit "arrogant".

This may be the case in other professions, but certainly not in the criminal profession.

Their work is full of lies and deception, and the enemies they face are trying every means and trick to get away with it.

Just a test with an instrument was impossible to dispel their suspicions.

Even when Karasawa implemented this policy, he said that polygraphs could only be used as supplements and could not be brand new at all.

The purpose is to prevent inaccurate things from happening. The upper-level bosses also know this, and the initial positioning was indeed to use it as an auxiliary tool.

This time I paid more attention to it because I was afraid that the other party would have a way to evade the polygraph.

If countermeasures had emerged, there would be no need for large-scale use of polygraphs.

To put it simply, the above can tolerate the error rate, which is inevitable, but it cannot tolerate the method of cracking the instrument.

This is conceptually different.

When an auxiliary tool can significantly distort the reference, there is no need to exist.

It was precisely because of the different natures that Hiroshi Saito quickly called Karasawa to inform him of the seriousness of the matter.

"This is the situation." After Tang Ze read the information and video, Officer Megure said: "We can't confirm whether there is any problem with the other party.

But the lie detector test did show that he didn't know the details of the killing..."

"The case is now at a deadlock." Takagi on the side also sighed: "Our investigation can't find anything useful about the other party, and his alibi is also perfect."

"Just because you don't know how the murder happened, doesn't mean there are no problems."

Tangze said in a deep voice: "Generally speaking, even people who have nothing to do with the case will be a little nervous or even suspicious when they undergo this kind of examination for the first time.

But his performance was too calm. In the video, I found that he hinted at words that induced you to use a lie detector on him. "

"What!?" Takagi was shocked when he heard this: "Are you saying that we have all fallen into the trap?"

"Generally speaking, human nature is to seek advantages and avoid disadvantages. Now that I have proven my innocence, there is no need to provoke criminal prosecution, right?"

Tangze said: "People avoid criminals in the office for fear of getting into trouble, but the other party mocked you before leaving. This is obviously not in line with the mentality of a common suspect.

There are not many fools who can become associate professors. Weighing the pros and cons is something every adult will do.

In other words, he should have done it for a purpose. "

"We should use the power of science more so that we can find out the matter clearly."

It was these words with provocative and hidden hints that made Takagi think of using a lie detector.

Karasawa even suspected that the other party knew about the Metropolitan Police Department's recent decision to introduce "lie detectors" and then formulated the "trick" based on this decision.

After all, if the other party does not induce him to take a "lie detector" test, then the police will definitely continue to investigate the other party.

But now, polygraph tests are also done.

If you can't produce tangible evidence or make breakthrough progress, you won't even have an excuse to ask the other party to cooperate with your "informal search."

When someone says, "I've even taken a polygraph test," you'll be blocked to the bone, with no room for maneuver.

　Thanks to the man who was born in the 80s for his gift of 100 starting coins~
  　　
  　
  (End of this chapter)