Seeing Liu Xia frowning, Xu Youming showed off his knowledge with a little pride: "In 1950, foreigners Merrill Fried and Melvin Drechier put forward a theory that assumed that two conspirators were imprisoned, and the police would first make it impossible for the two parties to communicate with each other.

At this time, if neither of them reports the other, because the evidence is uncertain, and the police prosecute, the two will only go to jail for one year each. However, if one person denounces and the other remains silent, the whistleblower will be released for meritorious service.

When the whistleblower is released by the police for meritorious service, the silent person is imprisoned for five years for not cooperating. However, if the two expose each other, the police will both sentence each other to two years in prison because the evidence is credible.

Because the prisoners cannot trust each other, when they are separated, they fear that the other person will betray themselves in order to be released, so their subconscious minds are all inclined to expose each other rather than remain silent together, which is known as the -----prisoner's dilemma.

What you just used on us is the psychology of the prisoner's dilemma, you want us to expose each other, but you didn't expect me to crack this trick, comrade officer, what else do you have to do, just use it. ”

The scheme was exposed, Liu Xia had a headache and was a little helpless, it was obvious that Xu Youming had expected that the police would interrogate them in isolation, and in order to avoid the police using the "prisoner's dilemma" method to trick them into confessing and confessing, they agreed on a strategy in advance.

Xu Youming's voice shouted from the corridor was to inform Dong Fucai and the others that the police had nothing to know and were deceiving them. So after hearing the shout, Dong Fucai, who originally planned to confess, immediately changed his tone.

It stands to reason that when the criminal police team escorted Xu Youming to the toilet, they should be strictly guarded and forbidden to make abnormal actions or abnormal noises, but at the moment, Liu Xia is just an auxiliary policeman, and he is not qualified to criticize or accuse anyone, so he can only find another way by himself.

However, although Xu Youming saw through the plan, Liu Xia was not without gains, at least he was sure of one thing, that is, Xu Youming and the three of them were all insiders of the case, otherwise, it would be impossible for them to formulate an offensive and defensive alliance.

After wandering around the corridor twice, Liu Xia's eyes suddenly lit up, he came to the monitoring room, and glanced at Lu Yanfeng and Chen Qingzao inside, Liu Xia opened the monitoring platform in the reservoir area and read the monitoring screen near the electric gate.

Seeing Liu Xia's actions, Lu Yanfeng and the others came over, and when they saw that Liu Xia was reviewing the surveillance, they didn't make a sound.

Reading out last night's surveillance footage, Liu Xia observed slowly, he wanted to see who pulled the switch last night, but the monitoring near the switch actually had a dead end, and the suspect happened to pull the switch from the position of the monitoring dead end, and the surveillance did not take pictures of the figure of the switcher.

"If we could see the figure of the gatekeeper, we would have started to arrest people a long time ago, why wait until now, I thought I had found some clues, but it turned out to be doing these useless work. Lu Yanfeng complained angrily.

"No, this is not useless, only people who often haunt the reservoir know that the monitoring probe above the electric gate has a dead end, Xu Youming is studying outside, and he rarely has the opportunity to come to the reservoir, so he does not know the blind spot of monitoring.

Dong Fucai's father and son are both locals, and their residence is very close to the reservoir, so they often visit the reservoir, and many villagers who come here to fish have slipped in from the monitoring corner, and I estimate that Dong Fucai and they must also know the blind spot of the monitoring probe. ”

After whispering this, Liu Xia's face shook, he picked up the microphone in the monitoring room, turned on the call switch, and issued an order to the criminal police team members responsible for guarding Dong Fucai and the three through the wireless Bluetooth headset: "The three of Dong Fucai were questioned at the same time, and there was only one content, asking him why he pulled the electric switch of the substation box?"

After receiving Liu Xia's order, the criminal police team members in charge of guarding were stunned, although they didn't know what Liu Xia wanted to do, the team members still carried out Liu Xia's order, and asked the suspects they were guarding at the same time:

"Xu Youming, why did you pull off the electric switch of the substation?"

"Dong Fucai, why did you pull off the electric switch of the substation?"

"Dong Lufu, why did you pull off the electric switch of the substation box?"

After hearing this question, Xu Youming in the waiting room was stunned. Dong Lufu in the first interrogation room was stunned, and Dong Fucai in the second interrogation room was stunned.

Xu Youming: "I didn't pull the gate?"

Dong Lufu: "What do you mean?". ”

Dong Fucai: "You ---- how do you know that the monitoring there can't see the transformer----- there?"

……

In the waiting room, Xu Youming, who finished answering the question, seemed to have thought of something? Suddenly, his expression tightened, and he secretly said in his heart: "Oops." ”

Thinking of this, Xu Youming covered his stomach again and begged the guards, saying that he had to go to the toilet, he couldn't hold it back, just when the team members were about to agree, Liu Xia suddenly walked into the waiting room, he took a washbasin, and handed it to Xu Youming with a smile: "Just solve it from here." ”

"You ---- you---- you cheat, you know that one of the three of us pulled the switch, but you don't know who it is, so you asked the same question to the three of us.

People who didn't pull off the switch, don't understand why you're asking. But the person who pulled the switch will definitely be shocked when he hears your question, he thinks that his actions are exposed, and then the flaws will be revealed. Xu Youming was a little impatient.

"You're right, I now know that the person who pulled the power gate is Dong Fucai, and I also deduced another clue, since Dong Fucai is responsible for pulling the gate and cutting off the power, there must be someone else who transferred the body.

I concluded that the person responsible for the transfer of the body was between you and Dong Lufu, or it could be the body that the two of you transferred together, and later, I went to Dong Lufu and said that you had turned yourself in and confessed. ”

"They won't believe you------ they won't be fooled. Xu You was obviously not calm.

"Don't worry, I'll make them believe me. After speaking, Liu Xia asked the guards to plug Xu Youming's mouth, and then ordered the No. 1 and No. 2 interrogation rooms to bring Dong Fucai and Dong Lufu to the door respectively.

After the team members were ready according to Liu Xia's instructions, Liu Xia arranged for two team members to hold Xu Youming, and then he pretended to be cordial and happy, and happily sent Xu Youming out of the case handling area.

When he walked to the door of the police station, Liu Xia deliberately shook hands with Xu Youming and asked the team members to send him home.

The father and son had just been escorted into the interrogation room, and Xu Youming, who had just left the police station, was escorted back by the team members.

was held in the middle by the criminal police team, shouting something in his mouth, and struggling with his hands, but the two team members who held him were tall and big, and he spent a long time, but he couldn't help himself at all.

In this way, Xu Youming turned around from the door and was taken back, but Dong Fucai's father and son did not see this process, they only saw Xu Youming being sent away from the police station by Liu Xia, and they didn't see the scene behind.

Seeing that the police sent Xu Youming away, Dong Fucai's father and son's faces were full of disappointment and frustration, and at the same time there was a trace of anger. Just when Dong Fucai's father and son were full of anxiety and at a loss, Liu Xia came to the interrogation room.

Liu Xia first came to the interrogation room where Dong Lufu was held, and he told the other party with a serious face that Xu Youming reported him for transferring the body of the deceased, and reported that Dong Fucai pulled the electric switch and cooperated with him to transfer the body.

Then, Liu Xia came to the interrogation room where Dong Fucai was being held, and as soon as he entered, Liu Xia told him that Xu Youming had confessed to everything, the electric gate was pulled off by Dong Fucai, and the body was transferred by Dong Lufu, and the case could be closed.

Subsequently, Liu Xia bullied Dong Fucai's father and son for not understanding the law, and he told the two that because Xu Youming had turned himself in and confessed, now their father and son must go to prison to serve their sentences, and after that, he couldn't help but put the two into two police cars and went straight to the county detention center.

When the police car was halfway through, Liu Xia used the walkie-talkie to get in touch with the team members escorting Dong Lufu, and he told the other party that Dong Fucai had taken all the crimes in order to protect his son, and now Dong Lufu could be acquitted.

Because the sound of the walkie-talkie was very loud, Dong Lufu heard the content clearly, and heard that his father confessed his guilt in order to protect him, Dong Lufu was excited and a little ashamed, and then he shouted to the accompanying team members: "I surrendered, I confessed, I did all these things, and it has nothing to do with my father." ”

Actually, what he said just now was made up by Liu Xia, he had used this trick on Dong Fucai before, but due to Xu Youming's sabotage, that strategy did not succeed, so this time he changed his target, and sure enough, Dong Lufu, who had a rough personality, was fooled.

When Dong Lufu was willing to turn himself in and confess, he first ordered the police car to return, and then called the police car where Dong Fucai was being held.

After connecting, Liu Xia didn't say anything, but played the recording of Dong Lufu just now to Dong Fucai, Dong Fucai, who was still a little calm, heard that his son actually took everything over in order to protect himself, and he couldn't sit still:

"Comrade policeman, this is none of my son's business, Lu You's death has nothing to do with him, this is all Xu Youming's plan, I am willing to surrender, please let my son go, this matter really has nothing to do with him." ”

In the conference room of the police station, Xu Youming was locked up here, and Liu Xia was calling in front of him, after hearing the words of Dong Fucai's father and son, Liu Xia had a smile on his face, and Xu Youming, who was opposite him, lowered his head with a decadent face.

Fifteen minutes later, Xu Youming, Dong Fucai, and Dong Lufu were locked in three interrogation rooms, Liu Xia and five members of the criminal police team were in charge of the interrogation.

"Name!"

"Age!"

"Address!"

"Contact!"

"Do you know why you're being asked?"

The interrogation began to proceed in an orderly manner.

Originally, Liu Xia thought that as long as the other party confessed and confessed, the case would be closed, but he didn't expect that when the three of them confessed what happened, Liu Xia and the criminal police team members in charge of interrogation at the scene were all stunned, and everyone was stunned in place.