Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Surveying the office now.

Lu Chuan is analyzing and identifying the footprints collected at the scene.

Due to the large amount of blood at the scene, the footprints left by the murderer were very clear.

In addition, Lu Chuan also collected some blood stains on the wall and prepared to do some blood stain morphology analysis.

This auxiliary footprint identification result can more accurately identify the physical characteristics and age range of the suspect.

In recent years, a term called murderer profiling has emerged in the field of field investigation.

In fact, this is not a new statement. The murderer's portrait has been around for a long time, and the Haizhou City Public Security Bureau has a dedicated suspect portraitist, who is currently assigned to the Picture Detective Brigade.

In recent years, murderer portraits have a broader meaning, not only referring to the murderer's facial features, but also including physical features, age range, personality traits, psychological characteristics, etc.

It is an emerging comprehensive discipline. When Lu Chuan was in college, some tutors were leading doctoral students to study this direction.

Of course, the effect is not particularly ideal, because obtaining an accurate and complete portrait of a criminal suspect involves not only professional criminal investigation knowledge, but also psychology and other aspects.

Lu Chuan had some exposure to criminal psychology when he was in college, but he didn't study it in depth.

"Footprint... length... width... front and rear foot pressure analysis and comparison..."

The murderer left a lot of footprints at the scene, which could reveal a lot of body shape information, such as gait, gait angle, stride length, etc. Lu Chuan had a lot of data to analyze, and he couldn't finish it in a short time.

On the other side, Yang Sen and Lao Bai are also doing fingerprint identification analysis.

Liu Guodong found at the scene that the fingerprints collected were relatively complete and it was relatively easy to make mistakes.

After the on-site investigation, the second operation team collected everyone's fingerprints and footprints during the questioning process.

"This fingerprint match is successful."

"It belongs to the stevedore Zhang Shuang."

"I have also succeeded in this comparison, and it is also a worker..."

The fingerprint identification process went relatively smoothly, but the results were not ideal.

There were obvious wipe marks on the murder weapon on the back of the deceased, and the fingerprints were processed before the murderer left.

Lu Chuan checked every inch of the human skin on the wall. Forget about fingerprints, he found a lot of bloody scratches. They should be traces of the force left when the skin was pulled and nailed, but the marks were smooth and the murderer should have worn it. Like rubber gloves that fit tightly against the skin.

The possibility of solving a case through fingerprints is getting smaller and smaller.

On the other side, the action team is also conducting an investigation into the interpersonal relationship of the deceased Zhang Xiaofeng.

Zhang Xiaofeng worked odd jobs on construction sites in his early years. Later, he became a contractor because of his daring and hard work. Gradually, he gained a group of people under his command.

After Zhang Xiaofeng made his first pot of gold in the construction industry, he did not continue to work in this industry. Later, he opened a game hall and ran a chess and card room in the city. He met people from all walks of life and had complicated interpersonal relationships. He only opened it five years ago. This eastern suburbs lumber factory, until he was killed.

"Divide into three groups, one group will go to Zhang Xiaofeng's hometown and investigate the situation in the village. The focus will be on those people who followed Zhang Xiaofeng to work back then to see if Zhang Xiaofeng had any enemies back then."

"The other team focused on the game hall and chess and card room that Zhang Xiaofeng opened before to find out who Zhang Xiaofeng had conflicts with back then. The key point is to focus on investigating those who had conflicts."

"The third group focuses on the Dongjiao Timber Factory. In the past five years, everyone who has worked in the factory and later resigned will be investigated. The focus is on whether any of them were fired by Zhang Xiaofeng. There may be resentment. of."

Based on Ren Qiang's experience in handling cases, there are two possible possibilities for the murderer to use such cruel methods, peeling off the skin of a living person and then killing him.First, the murderer is a pervert, an extremely psychopathic psychopath, who is extremely obsessed with killing people. He kills people to satisfy his perverted mental needs. In other words, the murderer should be a psychopath.

But this possibility is relatively small, because most of these people are serial murderers. For them, killing is just a simple spiritual need. There is no need to have any motive for killing. They can kill anyone on the street.

A long time ago, there was a murderer on a rainy night in Haizhou City. The murderer had no motive for the murder. He just went out on rainy days to look for women with clothes on.

On rainy days, wear red clothes.

If these two conditions are met, he will kill someone, it's that simple.

After he was caught, psychologists conducted psychological tests on the murderer, who showed that he had an extremely rare overly paranoid personality.

When certain stimulating conditions are reached, the murderer himself cannot control his inner needs.

But this does not mean that the other party is mentally ill. He can perfectly control his own behavior. His methods of committing crimes are secretive and cruel. He is a natural person with complete behavior.

The second type, which Ren Qiang thinks is the most likely, is revenge killing.

The murderer and the victim had a huge grudge, so the murderer resorted to such extreme methods to torture the other party by cutting off the tongue, damaging the vocal cords with sulfuric acid, and skinning the victim alive.

Moreover...Ren Qiang feels that there is a high probability that it has something to do with the lumber factory.

This kind of revenge killing can actually happen anywhere, but why did the murderer choose the lumber mill?

You know, there are more than 30 people living in the factory. The murderer committed a murder in the factory area, so there is a huge risk of exposure.

In addition, the murderer should be very familiar with the schedule of the lumber factory, otherwise, the murderer would not choose to attack in the factory.

The risk of being discovered is too great.

At [-]:[-] p.m., Qin Yong presided over a case analysis meeting in the criminal investigation detachment conference room.

"Forensic doctor, Lao Wang, please tell me the situation."

"Okay, the autopsy results are out, I'll probably report them."

"The deceased Zhang Xiaofeng, male, 49 years old, from Haizhou City, died at 01:30 this morning. He suffered severe abuse before his death."

"Here, we found the deceased's tongue and the sulfuric acid bottle at the crime scene, in the corner of the wall where the human skin was nailed."

"The diluted sulfuric acid used by the murderer is not fatal, but it is enough to damage the vocal cords."

"The purpose of the other party's doing this should be to prevent the other party from making any noise when abusing the deceased."

"The fatal wound was on the back, which was reduced to the point of penetrating the back of the heart. The deceased bled to death from excessive blood loss."

"How is the skinning technique? Do you have any professional background?"

Wang Changjiang shook his head. He knew that Qin Yong meant whether the murderer might have a professional background such as a doctor.

"Probably not. The murderer's skinning technique was very rough. The skin was not completely peeled off. There were many damages and traces of violent tearing."

"From a forensic perspective, the murderer's purpose is to torture the other person." (End of chapter)