National Forensic Doctor

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Returning to Bar Street again, the shops around the "Utopia Craft Beer Hall" have resumed business.

The afternoon is not the normal business hours for bars, but today, the bar next to the "Utopia Craft Beer Hall" blocked by the warning tape is full of people coming and going.

There are few new things in the small county. An occasional murder in a bar arouses the interest of fashionable men and women.

After all, this is an internet celebrity event that can compete with girls from big cities. No matter how many new things there are in your big city, why don't you just show them to me in a public place? No, right? No, everyone is tied today.

Mu Zhiyang waved his hand in disgust and drove away the few people who were taking selfies on the cordon: "This is not a good thing, please stay away."

"Officer, we are recording." A young man's mobile phone camera was already looking over.

Mu Zhiyang frowned slightly, but before he could speak, Tang Jia, who had come with him, had already stood in front and said sternly: "You can take pictures, but you are not allowed to enter the cordon, and you are not allowed to touch the cordon. In addition, you can Upload the video, but it must be uploaded in its entirety. You cannot cut off the beginning or the end, just cut off a section of it. If you take it out of context, colleagues from the Internet Security Team will contact you."

Tang Jia worked in Changyang City and specialized in crowd management. She didn't speak fast but was full of authority. In addition, she grew up very fast and quickly divided the young people in front of her.

"Let's take a photo together. Some young people shamelessly posted it.

"You are not allowed to approach the warning zone, and I will not take a photo with you." Tang Jia pushed away the boy who was approaching him without hesitation.

The police's use of crowd control does not mean that they have to give up the use of violence. On the contrary, the traditional function of the police is violence-based. "Replying violence with violence" is not the only option for the police, but it must be one of the options.

Jiang Yuan looked back and saw that most people were just holding up their mobile phones to take pictures. Tang Jia also had experience, so he bent down and entered the warning zone, and then entered the "Utopia Craft Beer Hall."

During the second on-site survey, there was no need to lay a plank bridge. Jiang Yuan directly led people and began to observe various entrances and exits.

It is impossible for the murderer to disappear out of thin air. He has never appeared on camera, which only shows that he does not take the usual path. But from the perspective of on-site investigation, as long as you think of this or notice this behavior of the murderer, things will become more complicated. Back on track.

Moreover, as Jiang Yuan said in the conference room, the murderer will only leave more traces and provide more information.

From the perspective of traces, normal entry and exit through the door is the way to leave the least traces.

This is because there is more than one person entering and exiting the door, and every subsequent entry or exit of a person will cause damage to the scene. This is the most troublesome thing in crime scene investigation.

On the contrary, it is a trace of not taking the usual path, leaving a trace that is simple, but has a better utilization rate.

The only question is where to leave it.

Jiang Yuan was not in a hurry. He took a careful look at all the doors and windows that could be accessed with the naked eye. If he couldn't see clearly with the naked eye or was unsure, he used a horseshoe mirror to look at it.

If the murderer wants to escape, he will definitely not be able to spend too much time covering up the traces. Even if it is spent, Jiang Yuan's approach cannot actually cover it up.

In this era where leaving roots is equivalent to filming a short film, few murderers can leave no traces. Especially indoors, it is so difficult that it requires not only professional knowledge but also long-term practice.

The murderer in front of him was already very skilled, but in the face of LV4's crime scene investigation and Jiang Yuan's two-hour meticulous investigation, Xingzang was still easily exposed.

"This window is closed from the outside, using a little trick." When Jiang Yuan checked the window of the toilet on the second floor, he easily found many traces.

This level of concealment can only fool the 1V1 level trace inspection. If there is a half-step LV2 trace inspection, you can make a similar judgment with a little more seriousness.

It is really difficult to leave no traces, especially if you want to use a very short crime incident to resist the longer search by the trace inspectors, it is twice as difficult.

Follow

The policeman from the police station who came with him looked at the location and said, "This is the second floor. Below is the back alley of the bar, but there are also cameras in the back alley."

"Bring a chair over here."

Jiang Yuan asked for a chair, stood up on it, opened the window, and took a closer look without touching anything.

"There are footprints on the air conditioner. There is a protruding part of more than ten centimeters wide on the wall. There are also footprints. They should be left in the past few days. Well, send a car over." Jiang Yuan didn't even stand up, so he took a few pictures with his mobile phone. Take a photo and then move on to check out the other doors and windows.

After all the doors and windows were checked, a lift truck borrowed from unknown sources also drove into the back alley of the bar.

Jiang Yuan climbed onto the lift truck again, took pictures and took samples again.

The outer edge of the bar building was covered with dust, and the extracted footprints were extremely clear. After Jiang Yuan analyzed the footprints for a while, he felt that he could directly draw the person's back.

Although this set of footprints may have been left by a wandering wild mandarin duck, since there are no corresponding traces on other doors and windows, the suspicion of this set of footprints is very high.

"The sample is about 176 centimeters tall, 70 to 75 kilograms, and about 35 years old. There should be signs of exercise. The body fat rate is low. It is most likely similar to the victim's body fat rate. It is similar to the figure of an athlete. The balance of the body is also very good. Yes, I wear size 43 sneakers and have a relatively low arch, so I’m probably not a professional athlete.”

Jiang Yuan read out the footprints in minutes.

Mu Zhiyang hurriedly took out his notebook to record.

"Go this way. Jiang Yuan pointed in the direction of the footprints, and then walked this way.

The footprints extended forward six buildings, which meant that the murderer had been using the second floor as a platform and walked hundreds of meters from the second floor.

Jiang Yuan's mind immediately recalled a certain parkour master he had met.

However, this person probably didn't learn parkour, because he didn't leave many handprints along the way. He basically relied on his impressive balance to keep moving forward.

As a result, Jiang Yuan obtained a large amount of gait information.

The more you cover up, the more you expose. With the clear footprints he saw now, Jiang Yuan felt that he could recognize the person directly by seeing his walking back.

When the footprints ended at the entrance of an alley, Jiang Yuan looked around and quickly focused on the signboard of a 24-hour hot pot restaurant.

"Ask them if there were any customers in their store at three or four o'clock last night. Jiang Yuan walked around the hot pot restaurant again and clicked on a few cameras in the distance to ask people to check the morning surveillance.

After finishing this round of things, Tang Jia, who went to the hot pot restaurant to ask questions, had already called back, "Captain Jiang, we found something!"

A group of police officers crowded into the elevator and filled the car to the brim.

Hot pot restaurant.

Tang Jia is helping the clerk remove the hard drive.

Seeing Jiang Yuan and others come in, Tang Jia showed Jiang Yuan the photo he had taken on his mobile phone and reported: "At 3:50 last night, this person walked into the store alone, ate hot pot and left at around 6 o'clock."

The man in the photo is dressed in black. His height and body shape are very consistent with the judgment Jiang Yuan just made.

"Quite smart." Jiang Yuan retreated. Don't look at it, there are only more than 2 hours left. If you don't find this hot pot restaurant and blind the surveillance, you may not be able to find anyone.

However, this person has special abilities. If he were an ordinary person, not to mention how difficult and dangerous it would be to walk along the outside of the building, as Jackie Chan did. He would determine where there are cameras and where there are no cameras, and then plan out Every route is very tiring.

"Ask Zhuang Wei to update the time and see if he can find his means of transportation. Make notes for all store employees. Others who are not at work, including those who have asked for leave, should also be recorded. Those who have resigned in recent days must also be recorded." Jiang Yuan thought for a moment and made arrangements.

This case must have been investigated in advance, but the murderer is not a local, so it is not clear how the decision was made.

If it is a small case, the case can be almost closed once the criminal is found, but not in murder cases.

Yes, the clerk in the hot pot restaurant has to check it.

After Jiang Yuan finished speaking, he took out his mobile phone and called Huang Qiangmin, asking him to ask a technical detective to check the mobile phone. As the masters, technical investigators basically operate in a black-box manner. The criminal police make a request, and the technical investigators just output a result.

Huang Qiangmin naturally agreed, and then said, "If he is a very professional killer, then it is possible that he hired someone to kill someone?"

"It's possible." Jiang Yuan also imagined the murderer's crime process, and said slowly, "A person who can safely eat hot pot at a crime scene must have more than one case like this. Unfortunately, the clerk has already cleaned the table, dishes and chopsticks. , the identity of the murderer cannot be determined yet.”

"It's already very good. Well, you should pay attention to your own safety. To avoid encountering the murderer returning to the crime scene, at least two people should be with you." Huang Qiangmin warned a few words and then said: "The case can do this The level is already a breakthrough, so don’t be too anxious.”

Huang Qiangmin began to care about Jiang Yuan's body.

When farming is busy, you have to spare no effort in animal power. When farming is slack, you naturally have to take good care of the big livestock at home.

Jiang Yuan had a lot on his mind. To be honest, he had done so many cases and traveled to many provinces and cities. This was the first time he had seen a professional killer or a case of paying someone to kill someone.

This made Jiang Yuan interested in both the murderer and the victim.

"By the way, go through the garbage in the hot pot restaurant and the garbage in the building to see if you can find the murder weapon." Jiang Yuan added another sentence to Tang Jiafen before leaving.

Tang Jia, who had been busy all day, felt bad when she thought about the garbage in such a big hot pot restaurant, including kitchen garbage and the garbage in the entire building. She couldn't help but take out her mobile phone and shine it on her face. Full of doubts: Is it because I didn’t put on makeup properly today that I have to dig through the trash? If I had known...