National Forensic Doctor

"I wish you all a successful start!"

Lei Xin stood in the office and spoke to a group of 24 criminal police officers.

They will go to 12 cities to interview more than 40 suspects.

In Qinghe City, the criminal police team still has to interview more than 300 suspects. These have been screened out, including Haojue car owners who have filled up their cars at gas stations in Qinghe City in the past three years, as well as individuals who have no car model records.

The tire tracks on the car are Haojue's original tires. Although it is possible that the criminal changed the tires of his motorcycle, this idea can be put aside for the time being. If no suspects can be found among these more than 300 people, If it is people, then consider whether to extend the scope to 3,000 people.

The 24 criminal police officers filed into the criminal police team's bus and drove to Changyang City.

Naturally, everyone's boarding time is different, but in order to save travel expenses, waiting for several hours at the airport is nothing.

Prior to this, another group of 36 criminal police officers had gone to the high-speed rail station several times and conducted investigations in various places.

Their task was to find the car owner, photograph the owner's gait, take footprints, and complete interviews at the same time.

Lei Xin himself turned around and got into a car and went to the countryside to investigate.

There are only a few gas stations in Qinghe City that allow refilling of bulk oil, but the people who come to refuel are distributed in various places. Some live in the city, but more of them live in counties and villages, as well as people living in the surrounding areas.

That is to say, the suspect committed the crime three times before Xu Taining was able to define a suspect's activity radius. Otherwise, the chance of this investigation will be very high.

Of course, if the suspect only committed the crime once, Xu Taining's investigation would probably not be needed.

Jiang Yuan doesn't have much work anymore. His task is to provide feedback to the investigating police officers at any time, mainly on whether the footprints are correct and whether the tire prints are correct.

These are the two main traces left at the scene.

Jiang Yuan has LV3 vehicle trace identification. Although it is not used much, it is still an expert level. The technical level is enough to ensure that difficult problems will occur at most, but there will be no misjudgment problems.

This is what Xu Taining likes about cooperating with Jiang Yuan. Jiang Yuan's technology greatly reduces the difficulty of his investigation.

A major difficulty in this case is that the suspect may not be at home.

According to the principle of "call for minor cases and visit for major cases", if the criminal police team wants to check these people, they can only find the city based on the registered name, ID number and phone number, and then ask the local police to cooperate to find the person. , took pictures of the gait, and took the footprints to the team, and then Jiang Yuan judged whether they matched.

Without the confidence of LV3, it would naturally be very difficult for such a case to go through such an investigation process. Of course, the police department often spends hundreds of thousands or even millions of dollars, only to find no case against this person, which is what Xu Taining tried his best to avoid.

The investigation pressure in Qinghe City is relatively not that great. Although Liu Jinghui's analysis cannot rule out the possibility of locals committing the crime, based on experience, this probability is still relatively small.

However, the criminal police still cannot make phone calls and have to visit each door one by one. If necessary, they must rely on technical investigation to determine the location.

In addition, the most important point is that there are two people on the list who are overseas. They can't even go home. They can only go to their homes to see if they can find motorcycles and then check the tire marks.

Boom boom.

The knocking on the door was loud and fast, which disturbed people.

"Who are you looking for?"

Inside the door, the old lady did not open the door directly, but looked outside and asked first.

"Is this Li Jiansheng's house? We are the police, please register. Please open the door." Wu Junhao showed his ID outside the door.

Li Jiansheng was an engineer working abroad, and he committed the crime at the right time. Wu Junhao came to help, so he naturally came first to the possibility.

"I don't know whether you are real police or fake police... Li Jiansheng is not at home. I am an old lady. If I have anything to do, I will wait for him to come back."

"It's okay if you're not at home. It's the same thing if you register." The policeman outside the door stood still.

The old lady said: "How do I know you are not bad people?"

"When you call 110, just say there are police at your door and ask if it's true." Wu Junhao has seen many people and doesn't really care.

The old lady hesitated for a moment and opened the door without actually calling.

"What's the matter?" the old lady asked.

"Register people who are outside." Wu Junhao and his colleagues entered the room, casually made up a reason, then took out his notebook, looked around, and said, "What is your name?"

"Liu Lan." The old lady stared at the two policemen with a somewhat worried expression.

Wu Junhao didn't pay attention. He looked at his phone and said, "Are you Li Jiansheng's mother? Do you usually live here?"

"Yes. My son usually does business outside and comes back two or three months a year. He doesn't come back until around the Chinese New Year." The old lady let down her guard a little.

The policeman opposite nodded, asked a few more questions, and then asked: "What kind of transportation does your family usually use? Car? Motorcycle? Battery car? Or bicycle?"

"I'll just walk or take the bus." The old lady shook her head.

"Where's your son?"

"Similar to me."

"Don't have a car?"

"No."

At this time, Wu Junhao was already on alert.

Many criminals or accomplices will subconsciously deny or cover up when talking about crime-related items. It's like asking a criminal suspect who used a kitchen knife to kill people if he bought the same kitchen knife. Most people will give a negative answer.

Although in the imagination of some people, it seems that they can give a positive answer first and then explain the irrelevance between the two, in fact, there are only a few people who really dare to do so. Because in the latter step, it is difficult to explain clearly the irrelevance between the two.

In comparison, direct denial is much simpler. In fact, denying the facts is the first reaction of many people when faced with fear.

Wu Junhao stared at the old lady and said seriously: "Ms. Liu, our police have records. Think about it carefully."

Liu Lan was a little frightened, so she really thought about it for a while, and then whispered: "My family really doesn't buy a car. My son works abroad, and it's useless for him to ask for a car. By the way, my son used to I bought a BMW from abroad and sold it after it was shipped back to China. Are you looking for this car?"

Wu Junhao waved his hand and said: "Ms. Liu, our records show that your son registered for refueling two years ago. It was to refuel a motorcycle..."

Liu Lan thought for a while and said cautiously: "Could that be the car he borrowed? He comes back from abroad and often borrows his uncle's motorcycle to drive."

"What's his uncle's name and where he lives?" Wu Junhao asked a series of questions.

Xu Taining has already explained that it is impossible to find out the source of motorcycles. The domestic motorcycle market is originally very chaotic, and some people can even equip a motorcycle by themselves using pure loose parts.

However, the channels for refueling are limited, and the average criminal suspect will not notice it to this extent.

Liu Lan was not prepared at all. Under Wu Junhao's questioning, she obediently told the information.

Wu Junhao informed the headquarters and led the people back.

Li Jiansheng's uncle lives in the countryside, and the criminal police team of Qinghe City still needs to send someone there, and at the same time contact the local police station for assistance.

Wu Junhao waited for almost two hours before following Jiang Yuan and getting first-hand information.

"The tire marks were determined to be different." Jiang Yuan carefully looked at the photos from the front and gave a positive answer.

Wu Junhao was stunned: "Is that wrong? Do you think they are the same?"

"It's different." Jiang Yuan said decisively: "At least it's not this pair of tires."