"In general serial homicides, the murderer has a fixed motive for killing, a killing pattern and the object of the killing, which is not easily changed, this is because the serial killer's killing behavior is to meet a fixed ideal goal in his mind, what is the reason why Cai Qianqian and Jarman were selected as targets?"

"Ah, I think about it, they're both women in their twenties and thirties, and both of them are artists. Han Han's eyes lit up, and he said with a flash of inspiration.

Well, that's the most obvious thing the two have in common. Chang Team nodded approvingly, although one was painting and the other was sculpting, but they were both in the scope of art.

And they all have intersections with Zhang Cheng. Qian Qian said weakly.

Everyone looked at him, and this was right, although it was very likely that Zhang Cheng was not the real murderer, but if there was anything the two of them had in common, it was that they both knew Zhang Cheng.

But there was so little information about it that they couldn't figure out what the killer's ideal goal was.

"In this way, according to the existing information, let's analyze the psychological characteristics of the murderer from the perspective of 'crime profile', and try to see if we can portray the character and behavioral characteristics of the murderer. Team Chang thought for a moment.

This is also a technique in the process of criminal investigation, through the crime scene, according to the direct or indirect information in the brain to reconstruct the crime scene, simulate the psychological outline of the murderer at that time, then analyze the victim, think about why the murderer chose them, and finally analyze the murderer, think and plan from the perspective of the murderer, to understand and experience the satisfaction.

Combine these aspects to form an image of the murderer in your mind, portray the character and behavioral characteristics of the murderer, and sometimes even portray the murderer's appearance, age, and industry......

This is not a metaphysics, but is supported by theories from various disciplines such as philosophy, biology, civil science, sociology, and trace mysteries, which is scientific and feasible.

Gao Lele briefly described the beginning and end of the two cases through Ye Fan, and said the sentence from the perspective of a bystander, in fact, he inadvertently pointed out the character characteristics of the murderer, and then caused Ye Fan to doubt the facts of Zhang Cheng's crime.

Because of the doubts in his heart, Ye Fan reorganized the information, reconstructed the crime scene in his mind with the method of reverse thinking, simulated the behavior pattern and psychology of the murderer, and obtained the result that was not established, and deduced the conclusion that Zhang Cheng was not the real murderer.

This belongs to the category of 'crime profile', but the real 'crime profile' is more complex and comprehensive.

Ye Fan has always been self-taught in the field of forensic science, and she is actually not professional in criminal investigation, but only relies on her boldness and carefulness and smart head to peel off silkworms, scrutinize the details, and then verify them in a way that is not enough for outsiders.

This method of stepping out of the box of criminal investigation sometimes does have unexpected effects, interpreting the case from another angle, making the Chang team admire her.

But when it comes to the criminal investigation profession, she can't catch up with them criminal investigation veterans, especially when it comes to complex criminal psychology, she has only seen some cases, and there is no theoretical basis at all.

"Then let's start analyzing from the two crime scenes," Chang Team stood up and walked to the left side ......of the meeting, where there was a whiteboard, he picked up a black oil-based pen, wrote Cai Qianqian on it, and then said, "Let's analyze the scene of Cai Qianqian's crime first." ”

"I went to Meng Hang to inquire just now, and he answered clearly that his leather shoes had never used the brand King Charlie, which was easy to find, I don't think he was lying, it is certain that it was left by the real murderer. Han Han said first.

"The murderer was wearing leather shoes at the time, ordinary young people don't wear leather shoes, you can exclude students, there is a school, the murderer can lay out such a clever killing in a short time, he must be very familiar with the school teaching room, if he is not a student, then only the school's teachers and professors, as well as the property, administrators, security guards, and even cleaners also have the possibility of wearing leather shoes. He Pingfei continued.

"It shouldn't be a property at the bottom, King Charlie shoe polish is expensive, not something that ordinary people can afford, I prefer the teachers and professors in the school, and even the leaders. Su Liang added, paused and said: "With such an expensive shoe polish, the leather shoes you wear should also be a big brand, and you should be a person who has certain requirements for the quality of life." ”

The team immediately wrote on the whiteboard, occupation: university teacher, professor, leader, age: over 30 years old, with a certain quality of life pursuit.

Ye Fan thought of what Gao Lele said, so he spoke: "If Zhang Cheng is not the murderer, then the platinum necklace that appeared at the scene of the corpse dumping in the wilderness must be deliberately left by the real murderer." ”

Zhang Cheng once said that he was sad that night, a person borrowed wine in Lover's Lake to drown his sorrows, and after drinking, he threw the necklace into the lake in anger, and he was sure that he did throw it on the lake. ”

"I went to the lover's lake of the art school, where there was a promenade, Zhang Cheng was drinking in the promenade that night, but there was a buffered meadow between the promenade and the lake, with his drunken and smoky state at the time, his hands and feet were weak, the necklace he may not have thrown into the lake, but fell on the grass, and then was picked up by the real murderer. ”

"Well, Ye Fan's conjecture is reasonable, and it also resolves the suspicion of the necklace very well, so the real murderer has long had the idea of letting Zhang Cheng be a substitute for the dead ghost?"

If Zhang Cheng is the murderer, taking away the diamond and replacing the platinum necklace is a stupid act of exposing his shortcomings, and his statement afterwards is that he threw it into the lake, isn't it more suspicious, but it is better to throw it in any corner, and it is easier to dispel his suspicion than the statement that he was thrown into the lake.

But last night Ye Fan mentioned that Zhang Cheng was not the real murderer, so Zhang Cheng didn't lie, how did the real murderer get the necklace from the Lover's Lake?

But if it is as Ye Fan said, it can be explained, when Zhang Cheng was drunk, the real culprit must be nearby.

"Nope. Ye Fan shook his head and said: "The real murderer wanted Meng Hang to be a substitute for the dead ghost at the beginning, after all, he was the one who was at the scene at the time, and later Zhang Cheng wanted Meng Hang to bear the charge of murder for what Meng Hang did on the Internet, and now that I think about it, Zhang Cheng was lured by the murderer in the dark to do these things." ”