Major Crimes Unit Starts with Police Academy Students

At this moment, Tai Wei could no longer contain his curiosity and stepped forward to ask,

"Mingcheng, I'm really curious. I really don't understand how you learned to make such accurate judgments?"

At this moment, everyone's attention turned to Wu Mingcheng, the hero of the night.

Lin Hao and Tai Wei looked at Wu Mingcheng with curious eyes, hoping to learn something from him.

Li Yao watched Wu Mingcheng with great interest, wanting to see just how far his junior brother had come.

Wu Mingcheng glanced at them and smiled slightly, but his mind was on someone else.

Fang Mu, I'm so sorry, I stole your thunder. Please don't blame me.

These are all tasks assigned to me by the system. If you want to blame someone, blame this damn system.

The system then sensed Wu Mingcheng's inner thoughts and responded.

"Every wrong has its perpetrator, and every debt has its debtor; the system won't take the blame for this."

Lin Hao, Tai Wei, and the other members of the criminal investigation team then took out their notebooks and began taking notes on the key points Wu Mingcheng had mentioned.

Wu Mingcheng walked to the blackboard, pointed to the photos of the victims, and said,

"First, looking at the scene, you can see the condition of the four female victims."

The victim's pants were pulled down below her knees, and there were abrasions on her knees.

Furthermore, a small amount of the victim's skin tissue was found on the rooftop railing, which matched the abrasions on the victim's chest.

This means that the murderer used a rear-entry position when committing the rape, which is a rather significant position.

Lin Hao asked curiously,

"Mingcheng, what does this mean?"

Wu Mingcheng explained,

"When a woman is having sex from behind, if the man holds her upper body down or grabs her hands from behind, she will struggle the least."

Furthermore, with her pants pulled down to her knees, her leg movement was severely restricted.

Therefore, this is also the posture least likely to provoke fierce resistance.

After hearing Wu Mingcheng's words, everyone suddenly understood, as if enlightened.

Wu Mingcheng then added,

"The rape case is arguably the most common type of criminal case we encounter."

I recommend you read the book "One Thousand Cases of Rape" by Romantic criminologist Woodsman.

This book contains analyses of various real-life rape cases, which will definitely be very helpful.

Upon hearing this, everyone present quickly wrote down the book's title.

Then, Wu Mingcheng spoke again,

"From a sex psychology perspective, rear-entry sex is the most primitive sexual position."

Because sexual intercourse gives men a strong sense of conquest and satisfaction,

Therefore, the psychological stimulation that rear-entry provides to men far exceeds that of other positions.

Tai Wei then spoke up.

"I understand now, isn't this also a reflection of the killer's personality?"

Wu Mingcheng nodded and said,

"Officer Tai is right. This shows that the murderer must have been a loser in reality."

He used his abnormal acts of sexual sadism and murder as a way to vent his hatred towards society.

This means that behavior X must have some special meaning for him.

It filled him with an extraordinary sense of curiosity, mystery, and excitement, yet also made him feel ashamed.

If men are able to establish normal relationships with women in the early stages,

So this excessively strong feeling about sex will gradually diminish as one gains more social experience.

Therefore, the killer is likely someone who is unable to establish normal relationships with women.

Such people often grow up in an environment lacking female care.

At the same time, people with this kind of X-psychology are definitely not very old.

Firstly, if one is older, they may be able to overcome this psychological barrier through other normal social experiences.

Secondly, this kind of mentality often appears during adolescence.

If he were older, he would have committed the crime much earlier, but no similar cases have occurred in recent years.

Therefore, the murderer, male, no older than twenty-five, with no female elders in his family, or only brothers, must have had a history of setbacks in life.

When they saw that Wu Mingcheng could deduce the murderer's family background, personal experiences, and personality based on only a few pieces of information, they were amazed.

Li Yao also looked at Wu Mingcheng with admiration, nodding inwardly in approval of him; Wu Mingcheng was indeed a promising talent for criminal investigation.

Chapter 156 Brilliant Reasoning

Then, Wu Mingcheng continued his analysis,

"Regarding the crime scenes, all four crime scenes were on the top floor of construction sites."

This is indeed an excellent location to satisfy the killer's desire to conquer the city.

This also means that he is very familiar with places like construction sites.

Therefore, the killer's occupation can be roughly determined; they should be someone with experience working on construction sites.

Tai Wei then nodded and said,

"No wonder you examined the crime scene so carefully when we were there,"

Lin Hao nodded in agreement.

"Yes, there are so many connections involved; we still have a lot to learn."

Xing Zhisen said from the side,

"You two are still far from perfect, take your time learning."

Then, Wu Mingcheng continued,

"And do you think a low-income person with such abnormal sexual psychology might have visited some brothels for prostitution?"

I don't think so. Even if it happens, it won't be too often because his financial situation doesn't allow it.

A more suitable place would be those low-end video arcades that often show pornographic videos after midnight.

Later, we found our clues in the video arcade, which perfectly illustrates this point.”

Then, Wu Mingcheng moved to the pictures showing the specific details of the deceased's condition.

"As you can see, one of the female victims had a broken fingernail on her left hand, and the severed fingernail was lying near where the body was lying on its back."

Strangely, among all the victims, this deceased person had the fewest injuries.

This also suggests that the deceased did not put up a particularly strong resistance to the rape.

This suggests that the fingernails may have been found after the perpetrator raped the victim.

During the strangulation, the victim's desperate struggle caused the injury.

We also conducted DNA testing at the scene and found skin tissue in the severed fingernail that did not belong to the victim.

Therefore, the victim's fingernails were likely torn off after contact with the murderer's body.

Wu Mingcheng paused for a moment, took a breath, and then continued.

"Since the murderer strangled the victim from behind, the victim's hands could only touch a limited area; the most likely candidate is the murderer's hands."

This means that when the fingernail scratched the killer's skin, it must have come into contact with some object and tore the skin.

What on your hands can tear your nails? Nothing more than metal jewelry, bracelets, watches, and so on.

Tai Wei and the others nodded in agreement after listening to Wu Mingcheng's words.

Wu Mingcheng had been trying to guide Tai Wei and Lin Hao's thinking and get them to express their opinions.

The two remained silent for a long time, instead focusing on remembering the key points Wu Mingcheng had made earlier.

Seeing this, Wu Mingcheng gave a wry smile, while Li Yao, understanding his intention, also smiled slightly.

Wu Mingcheng could only say it verbally.

"The first thing that comes to mind here is a watch, because this person lives a stressful life, and jewelry is impractical for him."

For someone working on a construction site to wear a metal watch is unusual in itself.

This person must want to show that he is different from other migrant workers.

His greatest pride must be his culture; the murderer must be someone with a certain level of education.

Then, Wu Mingcheng connected all the clues.

"Working on construction sites—possessing a certain level of education—having experienced setbacks in life—and being no more than 25 years old."