While the manhunt is in progress

Chapter 283 Exchange Principle
Dong Chuan was overjoyed by Song He's words. Obviously he had found the key clue of the case, and hurriedly urged: "Then don't hide it, talk about it."

Song He was also unambiguous, and directly handed the report to Dong Chuan, and said with a smile: "Actually, Mr. Shen and I had a trick, and simulated the psychological activities and behavioral characteristics of the last few people the deceased had contacted before his death. The culprit has been found."

This was a homicide case that happened two years ago. The victim was a middle-aged man who owned a highly acclaimed restaurant in the local area. Three days after his disappearance, his family called the police. Five days after his disappearance, his body was found in a garbage dump.

It is a pity that when the deceased was found, many parts of the body of the deceased were severely eaten by wild dogs. In addition to identifying the identity through biological information, no matter how hard the forensic doctor tried, it was difficult to determine the cause of death. Only poisoning was ruled out.

According to the remaining information on the remaining remains, it is speculated that the time of death of the deceased was three days after the disappearance, which was basically the same day as the time of reporting.

At the same time, due to the poor environment of the garbage dump, lack of monitoring, and disorganization, it is extremely difficult to restore the scene. It can only be confirmed that it is not the scene of the first crime, that is, the deceased was killed and moved to the garbage dump for disposal.

As for the rest of the information and traces, it can be said that there is zero harvest.

So the police investigated the communication records and contacts of the deceased before his death, and found that there was no abnormality in the communication records, but among all the investigated persons, five of them were suspected.

The five people were the lover of the deceased, a classmate of the daughter of the deceased, a friend who borrowed a large amount of money from the deceased, the dentist of the deceased and a shareholder of the restaurant of the deceased.

Unfortunately, it is difficult to proceed with the investigation once it reaches this point.It can be said that everyone has a motive for killing, but the key evidence has never been found, leading to a delay until today.

"According to the analysis of Mr. Shen and I, the murderer must go to the garbage dump to throw the body, so the principle of material exchange must apply. Since there is no way to find clues from the garbage dump, we can only find clues from people."

"Also, the murder took place on the third day after the deceased disappeared, which means that the deceased was hidden by the murderer in a certain place before his death, and this place is likely to be the scene of the first crime."

"According to the police's investigation, all the residences of the suspects, except for the deceased's home, have no biological information left by the deceased, so this hiding place cannot be the suspect's home."

"It is precisely because of this that the murderer will inevitably follow the principle of material exchange when he is in the hiding place."

Dong Chuan kept reading the analysis report while Song He was talking, but found that his eyes were not as quick as Song He's mouth, so he raised his head after only seeing the result, and listened to Song He's explanation with a little doubt.

Song He smiled when he saw this, and continued: "I believe Team Dong, you must have conducted a very detailed investigation at that time. If there are relevant clues, then you will definitely find the scene of the first crime, so as to determine the identity of the suspect."

"However, the relevant investigation materials are not unreasonably detailed, but we did not find anything suspicious. Therefore, Mr. Shen and I concluded that the murderer has the corresponding anti-reconnaissance capabilities, knows the principle of material exchange, and erased the traces left by himself after committing the crime. .”

"So, we conducted a personality analysis on each of the suspects you investigated, sorted out the behavior patterns of all people, and then simulated them. On this basis, we summarized the impact of the principle of psychological exchange on each person through the principle of material exchange .”

Dong Chuan asked without knowing it: "The principle of psychological exchange?"

Song He shrugged and said, "Mr. Shen and I chose the name as a joke. In fact, it means that the murderer will leave psychological traces when he commits the crime at the scene of the first crime and when he throws the body at the garbage dump. This is no matter what. Something that can't be erased."

"And these influences will bring about changes in the behavior of the murderer in his daily life after committing the crime, which is why we have to analyze and simulate everyone's psychology and behavior."

Dong Chuan joked in disbelief: "Have you started to engage in this kind of metaphysics after analyzing the case?"

Song He couldn't help laughing and said: "Captain Dong, are you trying to laugh me to death so you can dissect my brain?"

Gu Li on the side laughed, knowing that Dong Chuan felt relieved when he saw the outcome of the case. He wanted to tease Song He, but he didn't want to be teased by Song He instead.

Dong Chuan laughed for a long time before saying cheerfully, "Xiao Song, go ahead."

Song He nodded and continued: "In fact, this principle of psychological exchange can be reflected in many ways. For example, the vehicle used by the murderer to transport the corpse to the garbage dump will 100% leave an impact on the murderer's mind."

"Imagine, if he saw similar means of transportation frequently after committing the crime, he would definitely think of transporting the corpse frequently, resulting in psychological changes."

"And once the psychology changes, the behavior will inevitably change. Therefore, in this case, the principle of psychological exchange is the key clue that can help us locate the suspect."

"And in order to write more clearly, we typed out everyone's psychological analysis, all in the case analysis."

Dong Chuan nodded: "No wonder your analysis report is so thick, I guess it will take a long time just to read it. You should just tell the results."

"That's fine." Song Hezi said calmly, "Now it is basically certain that the murderer is the dentist of the deceased, because he changed a car in the third month after the deceased was murdered."

"According to our analysis, the dentist cherishes his last car very much. And the data shows that he has been driving for seven years, and the number of traffic accidents is single digits. The most serious accident was only caused by an inadvertent slippage shortly after buying the car. Scratch."

"However, it was such a car-loving and cautious person who actually drove the car into a ditch three months after the incident. Including the extremely short time interval between his traffic accident and the purchase of a new car, it was the same as he used to be. behaviors are very different.”

Following Song He's narration, Gu Li picked up the case analysis report and directly turned to the copy of the deceased's dentist. He saw that it listed the dentist's various psychological analyzes in detail. The logic was strict, easy to understand, and Gu Li frequently read nod.

However, at this time, Dong Chuan frowned slightly: "But without actual physical evidence, we have no way to convict."

"This is indeed a problem." Song He nodded and admitted: "Mr. Shen said that if the investigation was carried out immediately after the incident, the evidence should be found in the car and the first crime scene, but now he can only find a way to let him reveal himself. It's gone."

Dong Chuan nodded and said, "Understood, you can't leave all the problems to Mr. Shen. Let us deal with the actual investigation."

Song He asked curiously: "From what Captain Dong said, there is already a case against him?"

Dong Chuan smiled mysteriously: "I don't really understand the principle of psychological exchange, but since he has this psychological loophole, he just needs to take action against it."

Song He suddenly understood, and came up with two ideas, which immediately made Dong Chuan applaud again and again.

"By the way, Team Dong." After talking about the case, Song He asked, "How about Chen Haoyu?"

Dong Chuan shook his head when he heard the words, looked at the helpless Gu Li, and sighed: "If you don't ask me, I'm going to tell you. Old Chen met a hedgehog this time."

(End of this chapter)