Lin Xinyi was shocked by the news:

Although he knew that the theory of the prisoner's dilemma did work, and in the real world, this method of interrogation that separates the interrogation, breaks trust, and provokes competition is basically tried.

However, according to the experience gained by Lin Xinyi in the police force for several years:

The theory is easy to use, but it doesn't mean that the practice process is easy.

This is because criminals who dare to join forces to commit serious murder crimes are generally extremely resistant, and their interrogation often takes hours or even days.

It's like using a network disk account that has not opened a member to go down hundreds of G resources, and the interrogators must use extraordinary patience and meticulous and time-consuming water grinding to break down the suspect's psychological defense line little by little.

And now, Kuroiwa and Kawashima, the two suspects have confessed in less than 20 minutes.

I didn't even resist it...

Even if you are determined to surrender and hold on for a while, you can force the other party to come up with better terms of agreement, right?

Therefore, Lin Xinyi didn't expect that Heiyan and Kawashima would be able to confess their guilt so quickly.

"That's too cooperative!"

He sighed deeply in his heart.

But this is Lin Xinyi's empirical mistake, and there is no specific problem to analyze:

The basis of resistance to the prisoner's plight is the mutual trust between multiple suspects in a criminal gang.

As for Kuroiwa and Kawashima, they have long been enemies because of the election for village head, and they have accumulated deep grievances over the years, and they have no trust in each other.

In addition to this, one of the more important reasons is:

While distrusting each other, Kuroiwa and Kawashima also distrust Ken Nishimoto:

Ken Nishimoto quit the business 2 years ago because of psychological problems, and in the past 2 years, he has been living at home every day, from a whack to an abandoned house.

Every time I met with them, Ken Nishimoto didn't open any pot and mentioned which pot, and he had to shout crazy words such as "Keiji Aso is still alive" and "Keiji Aso has come for revenge".

At that time, the police had not even arrived, and Ken Nishimoto scared himself crazy.

Now that the police are here after the East Window incident, can this coward still be able to control his mouth?

Anyway, Ken Nishimoto will definitely not be able to hold on to admit his guilt and confess to them-

Since this is the case, then they might as well admit it as soon as possible and seize the opportunity to be the first to admit their guilt and surrender themselves to reduce their sentences.

Tatsuji Kuroiwa, Hideo Kawashima, both of them think so.

What they didn't expect was that the team's shortcomings they were most worried about became the pit stone that stuck to the end:

"No, I didn't kill anyone."

"Don't believe the nonsense of Kuroiwa and Kawashima... I was only involved in the business, not in the killing! ”

"At the time, it was Black Rock who threatened me with helping to make false testimony, and that's it... The rest of the matter has nothing to do with me! ”

Ken Nishimoto's face was covered with beads of sweat, but his mouth was even harder than before.

"When death is imminent, you still dare to swagger?!"

"Kuroiwa and Kawashima have been guarded by their side since they were arrested, and they have never had the opportunity to confess in advance."

"If they all identify you as a part of the killing, even though they are being interrogated separately, and the details of what they tell match each other."

"Then there is no doubt that you are involved in the killing!"

Lin Xin choked back with a few words.

But Ken Nishimoto is still there like a repeater: "No.... I didn't kill anyone..."

Lin Xin looked disdainful, but his brows quietly furrowed:

Although with the confession testimony of Kuroiwa and Kawashima, it is enough for Ken Nishimoto to be convicted together.

However, if there is an obvious conflict in the testimony of the three people, it will not only be difficult to successfully conclude the case, but will also cause fierce controversy in the subsequent conviction process.

"What a nuisance..."

Lin Xinyi's brows furrowed deeper and deeper.

And he also found that he seemed to have misjudged Ken Nishimoto's psychological condition.

Although this guy has done a lot of bad things, he is afraid of ghosts and people, and he is not afraid of punishment by God.

He can be frightened and autistic by the imaginary "Aso Keiji's evil spirit", but in front of the police, he can behave in a cowardly manner, appear stable in panic, and his ability to resist pressure is beyond imagination.

"Well, anyway, Ken Nishimoto can't get rid of his sin..."

"I have done everything I can, and I should leave the matter of sorting out the testimony and conviction and sentencing to those professional interrogators and judges."

Lin Xinyi thought about it, but he couldn't think of any way to make Nishimoto Ken honestly admit his guilt.

He plans to retire like this and hand over the problems he can't solve to his colleagues in the Metropolitan Police Department.

And at this moment, the door of the interrogation room just opened...

Asai Narumi's delicate face with a complicated expression suddenly appeared in front of Lin Xinyi:

"Mr. Lin."

"The police officers you sent out to investigate found evidence in the village that my father had left behind."

"Did you really find the evidence?" Lin Xinyi was a little surprised.

He sent the police to visit and investigate on Lunaris Island, just trying to gamble on luck, and he didn't have much confidence.

Unexpectedly, after 12 years, there is really evidence to survive:

"That's right, the evidence was obtained from the only serving veteran policeman at the Moonshadow Island Police Station when I visited and investigated."

"The police from the Tokyo Metropolitan Police Department did not survey the fire, but the grandfather of the police officer from the island police station found a safe from the rubble of my house that had not been damaged by the fire."

"There's nothing else in the safe, just a sheet music."

"And that sheet music has been kept in the office by the policeman's grandfather."

As he spoke, Narumi Asai took out a thin sheet of music from his bosom that had been stored in a plastic evidence bag.

He gently grasped the score, and his gaze deepened:

"This is not an ordinary sheet music, but a suicide note that my father left me with a code before he died."

"This kind of code language that corresponds the romanization alphabet to the piano keyboard, he taught me before, so I can read it:"

"In the suicide note left before his death, my father has written clearly the reason and process why the four demons locked them in the house and set them on fire."

"This is the evidence he left for us in the last moments of his life..."

"Mr. Lin Xinyi, with this suicide note, those wicked people should be punished, right?"

Asai Narumi gently handed over the sheet music, and looked at Lin Shinichi's eyes full of anticipation and gratitude.

Lin Xinyi took the mottled and yellowed score and looked at it carefully...

Seeing the traces left on the score, his expression gradually became solemn:

"Well, it will!"

"Now Kuroiwa and Kawashima have pleaded guilty."

"With their testimony, coupled with this suicide note, there is no possibility of turning the case around!"

The testimony obtained from the interrogation alone was enough to convict all three of them.

Now that this vital evidence is found, the combination of physical evidence and testimony makes the case completely irreversible.

"Ken Nishimoto! What else do you have to say? ”

"Now that the testimony and evidence are available, do you think you can continue to carry it to the death?"

Lin Xinyi's eyes were sharp and he looked at Ken Nishimoto, the murderer who insisted on not letting go until now.

"I—" Ken Nishimoto's face was extremely ugly.

But he now knows that he has been one step behind Kuroiwa and Kawashima in the competition, and has lost the opportunity to surrender and reduce his sentence.

So, this guy broke the can and broke it, and he became dead:

"Say what?"

"What does a sheet of music say?"

"How do you prove that this score was left by Keiji Aso?"

"It took 12 years to come up with such a sheet music... You say it's a suicide note, it's a suicide note? ”

Kengou Nishimoto jumped over the wall in a hurry, and even questioned the authenticity of the evidence.

And he questioned it with confidence:

The score had been kept privately by the old policeman for the past 12 years, and it was procedurally irregular, and its reliability was questionable when examined in detail - as long as you have the money to hire a good lawyer, this kind of evidence is not evidence.

And Keiji Aso's home was burned to the ground, and after so many years, it is unrealistic to find the words he wrote back then for handwriting identification.

Nishimoto Ken refused to admit it, but Lin Xinyi coldly showed the score in front of him:

"You want to ask me how to prove that this is a suicide note written by Keiji Aso?"

"See? Are there still a lot of yellow-brown marks on these yellowed papers? ”

"Mr. Nishimoto, what do you think it will be?"

"This—" Ken Nishimoto's expression froze.

But Lin Xinyi's cold eyes were lit with angry flames:

"The four of you... At that time, it must have been as simple as locking people in houses and setting them on fire, right? ”

"After all, Keiji Aso is an adult man."

"In order to protect his wife and daughter, it is impossible for him not to resist in the face of the murderer."

"So, before you locked Keiji Aso in the house, you probably had a fight with him, and you seriously injured him, and maybe even his wife and daughter!"

"And Mr. Keiji Aso, when the house was set on fire and he was seriously injured..."

"Dragging the broken body, trying his best, he left such a suicide note in the fire!"

"That's his last voice—"

"His voice is not only written in the ciphers of the notes, but also imprinted in these inconspicuous traces!"

Lin Xinyi's angry roar made Nishimoto's face pale when he heard it:

"Difficult... Could it be that the tawny marks on the score are..."

"It's blood."

"The old blood stains of the paper object are this color."

"At that time, Keiji Aso was seriously injured, and in the process of desperately writing this score, he also left his own blood on the score."

"The blood fell on the paper to form drip-like droplets, and some of the blood droplets were touched by the palm of the writing hand, forming a wipe-like blood stain on the paper."

"There are also some drops of blood stained with the tip of the pen, leaving blood when writing."

"There are two kinds of wipe-like bloodstains, which are enough to prove that the blood dripped when the suicide note was written."

"And taking these blood stains for DNA testing is enough to prove that the person who wrote the suicide note is Keiji Aso himself!"

Lin Xinyi told the facts in a straight and stern manner, completely dispelling Ken Nishimoto's illusions.

A DNA sample from the deceased can be extracted from the bones of the corpse, or the deceased's son, Narumi Asai, can provide DNA for comparison.

And the DNA identification of this kind of old blood stains from 12 years ago should be considered a difficult one in this era.

I don't know if the DNA identification technology of the current science research can be realized.

But just like the last time I scared that tram stop murderer...

Regardless of whether the current technology can do it or not, we will take it out first and scare it.

"Mr. Aso's voice left with his life has exposed your lies."

"Ken Nishimoto, what else do you have to quibble about now?!"

Lin Xinyi looked at each other angrily, and his momentum was terrifying.

Ken Nishimoto's psychological defense line finally completely collapsed at this moment:

"I... Plead guilty. ”