Chapter 340 Target Range


Chapter 340 Target Scope

Locard's law of material exchange has been continuously verified by all crime scenes, and there has never been a crime scene that has escaped the law.

This arson case is a good example.

After the murder, the murderer set a fire at the scene, destroying all traces of himself indoors.

But there are still some traces of outdoor traces left in the end.

Half a footprint may be the key evidence to identify the suspect.

Returning to the detachment, Lu Chuan went directly into the current exploration laboratory.

The first step is to identify the vehicle tire marks.

Based on the preliminary analysis of the scene, the tire marks found outdoors and the tire marks found indoors have the same prints and the same degree of wear, but the contact areas are different.

This shows that the traces left by electric vehicles outdoors are loaded.

What Lu Chuan has to do now is to calculate the load capacity of the electric vehicle based on the difference in tire contact area.

This is not easy.

Because there are many factors that affect the tire approach area, such as the age of the tire, the air pressure or the softness and hardness of the ground, all of which have an impact.

Fortunately, the tire marks Lu Chuan found were all on hard ground, and there was not much difference between them.

On the other hand, if the tires of the electric vehicle are intact, the air pressure inside the tires will not change significantly between indoors and outdoors.

In this way, Lu Chuan can calculate the load of the electric vehicle relatively accurately.

And this load should be the weight of the murderer.

In addition, there was a half-footprint found next to the tire tracks.

Based on the contour analysis, Lu Chuan was confident that he could complete the length of the entire footprint. In this way, he could calculate the height range of the owner of the footprint.

It is easy to say, but in actual operation, there are still many problems.

Lu Chuan's tire mark identification and analysis and footprint identification and analysis skills are at a basic level, and the methods he masters are still limited.

After working for more than three hours, Lu Chuan's work was initially completed at around 7 o'clock in the evening.

Dialing Liu Guodong, Lu Chuan gave a brief report.

"Okay, just bring the report over. I'm in Team Qin's office. You can report directly to Team Qin."

Ten minutes later.

"Based on the comparison of tire tracks at the scene, we can basically determine the suspect's weight, which is about 150 kilograms, and his height is between 1.7 and 1.8 meters."

This time, Lu Chuan asked about his height. The error range of the judgment is larger, after all, there is only half a footprint.

Qin Yong was in a good mood after taking the report issued by Lu Chuan!

"One hundred and fifty kilograms?"

"With a height of less than 1.8 meters, this is a relatively obvious feature."

Lu Chuan was also happy because the suspect's physical features were quite distinctive.

One hundred kilograms, he should be a fat man.

This measurement data also strengthened the conclusion that the person who left half a footprint outside was the suspect.

Because there were two deceased persons in the room. Although their bodies had been partially carbonized, it could be seen that they were both on the thin side.

Even if both of them are sitting on the electric car, it is impossible for them to weigh 150 kilograms.

Of course, if the two of them loaded anything else, that would be another matter.

So, what Lu Chuan reported was only very likely.

However, for Qin Yong, this is probably the biggest weapon in solving the case.

"Old Liu, send Lu Chuan's report to Ren Qiang and Sun Jun. They are checking the victim's network to see if there are anyone with similar physical characteristics."

"Yes. ! ”

People, you can’t look too distinctive.

Fat or thin, the average body shape is fine, but if you are too fat or too thin, you will leave a relatively deep impression on others.

This kind of impression is not bad, but if such a person commits a crime, the possibility of being recognized will greatly increase.

Liu Guodong sent the report made by Lu Chuan to the group, and there was feedback in less than 10 minutes. It was Zhang Meng, who was responsible for taking notes for the parents of the two deceased persons.

Zheng Caixia's parents provided an important clue.

“When Caixia and Zhao Ming were not married, they had a few dates. There was a man named Zhang Jianzhong who almost got married to Caixia. I had seen that man before, and he was quite fat.”

Zhang Jianzhong!

"Where is Zhang Jianzhong?"

"Our people are already investigating, soon..."

Before Ren Qiang finished reporting in Qin Yong's office, the phone rang.

“Brother Qiang, we found the person!”

Contrary to everyone’s expectations, Zhang Jianzhong himself lives in a self-built house on Shanghe Street.

Zhang Meng and others even visited his home to investigate in the morning.

“This guy lives two lanes away from the deceased. When we arranged for the police to visit and investigate this morning, he also said that he had participated in firefighting.”

In front of a private house, a dozen police officers were ready.

It is eight twenty at night.

Ren Qiang looked at the lights inside: "Are you sure someone is inside?"

"Inside, this Zhang Jianzhong works in a nearby food factory and gets off work at six o'clock every day. The neighbors are watching When he arrived, he watched him enter the yard."

Ren Qiang nodded: "Protect yourself and arrest him!"

The order was given, and a dozen people broke open the door and rushed in.

"Is that Zhang Jianzhong?"

When Ren Qiang entered the yard, Zhang Jianzhong was already pressed to the ground by five people and handcuffed.

This guy is really fat and surprisingly strong. .

Zhang Meng was suppressed by five strong men, but this guy could still struggle to move.

"Do you know why I arrested you?"

"Hey, hey, you guys...how did you find me?"

Half an hour later.

Criminal Investigation Detachment Interrogation Room.

Zhang Jianzhong was not placed on the interrogation chair. The man weighed more than 200 pounds and was too fat. The interrogation chair could not fit him.

Zhang Meng and the others got an ordinary stainless steel chair, put handcuffs and shackles on them, and they were restrained.

"Zhang Jianzhong, tell me, why did you kill Zhao Ming and Zheng Caixia?"

"Hey, there must be a reason for killing them, but how do you know that I killed him? "

"I set such a big fire, the fingerprints and footprints should have been burned away"

"Burn away?"

After Zhang Jianzhong was arrested, Lu Chuan didn't need to collect the footprints. He just took a look and knew that half of the footprints at the scene belonged to him.

With this evidence, Zhang Jianzhong can be convicted with zero confession even if he says nothing.

"You killed someone and then rode away on his electric bike. Are you greedy?"

Zhang Meng and Zhang Hui were in charge of the interrogation.

“I originally bought that electric bike, so of course I want to ride it.”

"Your electric car?"

Zhang Hui was a little surprised: "What does the electric car of Zhao Ming and Zheng Caixia have to do with you? Do you know each other?"

"Why doesn't it matter? He I met Zheng Caixia when we were not married. She promised me that she would marry me the year before last, so I bought her an electric car.”

“I also lent her 50,000 yuan. Yuan, but because she didn’t pay the IOU at that time, she married someone else and didn’t pay me back for two years.”

“Do you think this woman should be killed?”

(End of this chapter)

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