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

Chapter 340 Target Range
Lockard's law of material exchange has been continuously verified by all crime scenes, and no crime scene has ever 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.

However, there are still some traces of the outdoors.

Half a footprint may be the key evidence to lock down the suspect.

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

The first step is to identify vehicle tire marks.

According to the preliminary analysis on the spot, the tire traces found outdoors are the same as the tire traces found indoors, and the degree of wear is the same, but the ground contact area is different.

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

What Lu Chuan needs 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 proximity area, such as the age of the tire, the air pressure, or the softness and hardness of the ground, all have an impact.

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

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 are half footprints found next to the tire tracks.

According to the outline analysis, Lu Chuan is sure to complete the length of the entire footprint. In this way, the height range of the footprint owner can be calculated.

It's easy to say, but in practice, 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 around [-]:[-] pm.

After calling Liu Guodong, Lu Chuan gave a brief report.

"Okay, bring the report directly. I'm in Team Qin's office, and you report directly to Team Qin."

10 minute 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 meters and 1.8 meters."

This time, Lu Chuan's error range for height determination was larger. After all, there was only half a footprint.

Qin Yong was in a good mood when he took the report issued by Lu Chuan!

"150 kilograms?"

"Coupled with the 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 people in the room. Although their bodies had been partially carbonized, it could be seen that they were both on the thin side.

Even if the two are sitting on the electric car, it is impossible to have a weight of 150 kg.

Of course, if the two of them loaded something again, that would be another story.

Therefore, 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, normal body shape is fine, but if you are too fat or too thin, you will leave a relatively deep impression on people.

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 went on several dates. There was a man named Zhang Jianzhong who almost married Caixia back then. I've 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, the person has been found!"

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

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

"This guy lived two lanes away from the deceased. When we arranged for the police to visit and investigate this morning, the other party also said that he had participated in fire fighting."

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

It's eight twenty in the evening.

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

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

Ren Qiang nodded: "Be safe and arrest people!"

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

"Isn't that Zhang Jianzhong?"

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

This guy is really fat and surprisingly strong. .

Zhang Meng's five strong men were suppressing him, and this guy was still struggling to move.

"Do you know why I arrested you?"

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

After half an hour.

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 it was me who killed him?"

"I set such a big fire, all fingerprints and footprints should have been burned away long ago."

"Is it burnt?"

After Zhang Jianzhong was arrested, Lu Chuan didn't need to collect any footprints. He could tell at a glance that half of the footprints at the scene belonged to him.

With this evidence, even if Zhang Jianzhong didn't say anything, he could still be convicted with zero confession.

"You killed someone and then rode his electric car away. 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?"

"It doesn't matter. When they were not married, I knew Zheng Caixia. She promised me the year before last that she would marry me, so I bought her an electric car."

"I also lent her 5 yuan, but because there was no IOU at that time, she has not paid me back even after marrying someone else for two years."

"Do you think this kind of woman should be killed?"

(End of this chapter)