Chapter 347 Command

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"Human traffickers are always repeat offenders." Gao Changjiang frowned and answered Jiang Yuan, saying: "We have also screened all the human traffickers who have been released from prison recently. There are more than a dozen police officers doing this, and no one has been found so far."

Jiang Yuan straightened his waist and wanted to continue.

Gao Changjiang felt that Jiang Yuan did not know enough about the case, so he pretended not to see it and continued: "From the existing scene, there are indeed very few traces left by the murderer. That is why we asked the ministries and commissions to invite experts to assist..."

The experts present looked at the files and did not speak immediately.

Gao Changjiang sighed and said: "Although there are few traces, the support from our superiors is extremely high. As long as there is a little clue, we can track it down..."

"Director Gao, we have screened out as many valuable clues as possible since yesterday. Up to now, it is difficult to screen out reasonable clues." The expert sitting opposite Jiang Yuan pushed Gao Changjiang back.

There are huge differences between cases. In some cases, the criminals are ignorant and not careful, and clues are everywhere. The main job of criminal police or experts is to find the easiest clue, and by the way, when the person is caught, the chain of evidence can be complete.

But in some cases, the criminals are really careful. If there is a little coincidence or luck, there will be very few clues left.

In this case, it is very important to choose the direction of investigation. Some investigation directions can catch people at the time, while some investigation directions miss them. It is useless to find them later.

In the case of missing children, it is very difficult to encounter the second situation.

Suppose one or more criminals take the child away in a place without surveillance in a relatively secret way. During this period, as long as they are not stopped by anyone, there will be almost no traces left.

Especially in places like vegetable markets, people come and go, and traces such as footprints or fingerprints can only be described as a mess. Gao Changjiang wanted to use the human sea tactics before, which was to try to screen out criminals with previous criminal records from the vast number of fingerprints.

His idea is actually good, but fingerprint matching is not that fast now. Maybe it will be better with the application of AI technology in the future, but for now, it is still impossible to process hundreds or thousands of fingerprints.

The most likely and appropriate way is to monitor the comings and goings, but the problem is that now even the actual comings and goings of the criminals cannot be found.

The clearest and most reliable clues the police have are when and where the child was lost. Apart from this, there is almost no definite information.

You don't need to infer a certainty from a bunch of uncertainties, which is too difficult.

"I know that the case is difficult, but we can't just wait like this." Gao Changjiang persuaded everyone with a not-so-clever method, saying: "I suggest that we cooperate with Professor Liu to reconstruct the crime scene and do a new combing of the case to find out if there are other clues..."

Professor Liu, who was named, frowned, but did not object.

Other experts had similar expressions.

As technology goes deeper, certainty becomes less and less. Making things possible from the impossible is the daily routine of every expert present. Otherwise, how could it be possible to be listed on the list of ministries and commissions.

Although the difficulty still exists, everyone does have the confidence to force a breakthrough.

Jiang Yuan had no choice but to follow the others and go to the Ermaxiang Vegetable Market where the incident occurred. "

Gao Changjiang has actually blocked the vegetable market.

So, when he said that the search would start tomorrow morning, the actual work had already been done.

Expert Liu walked around the vegetable market twice to see the scene.

Jiang Yuan followed.

Crime scene reconstruction is a must-learn for every student majoring in criminal science. As for whether you can learn it well or not, there is no need to worry so much. For the same skills, refer to advanced mathematics and discrete functions.

Expert Liu took a notebook and a pen, and drew while watching. Occasionally he said a few words, and the assistant next to him took shorthand.

Jiang Yuan also mastered a little bit of crime scene reconstruction through the ability of bloodstain analysis, but looking at this kind of unred scene, at most it was level 5, just not showing any fear, so he didn't say anything and just followed.

Jiang Yuan had mastered the LV4 crime scene investigation in the early days, and in In such an environment, it is still possible to bring out good advantages.

Theoretically, if the scene where the last child disappeared can be found, Jiang Yuan is at least capable of separating the absolute majority of DNA at the scene, and there is a high probability that it includes human traffickers.

However, matching is still a big problem. Considering that a large number of fingerprints at the scene have been matched, it is not so meaningful to scan another wave of DNA. If the criminal wears gloves or something, the probability of leaving DNA is not high.

Bang!

Another super bright H-prosium lamp was turned on. This kind of lighting equipment, which is often used on construction sites, can illuminate an area of ​​1,000 square meters when hung high. If multiple lamps are hung continuously, the brightness in the vegetable market will not be lower than that during the day.

This will help find fingerprints and small physical evidence, if there are any.

"How is it?" Gao Changjiang has not slept for 30 hours, and his sleepy eyes are fighting.

Expert Liu shook his head: "When the criminal took the child away, there was no too intense action. It is very likely to be abduction or something like that. The most likely direction is along the flow of people. Among the several doors here, I think the door on the west is more likely..."

Gao Changjiang was quite disappointed. If it was just this level, he could say a lot, of course, he would just say it more casually.

"You can't wait for the criminal to commit a crime again!" Gao Changjiang cursed angrily.

Many crimes ended up like this. Because the murderer couldn't be found in the previous case, you can only wait and see the next case.

If the criminal stopped for some reason, the case would basically collapse.

"Look for the old case before." Jiang Yuan looked at the vegetable market, which was the most important scene, and just confirmed his idea.

Gao Changjiang had no other choice but to turn to Jiang Yuan and say: "We haven't matched the right old case yet."

"It doesn't have to be in this province. He always needs practice to reach the current maturity. There is also a way to sell it. If there is no way to sell it, there is no need to abduct 4 children at a time." Jiang Yuan has done so many cases now, and he has a better understanding of the level of criminals.

Gao Changjiang pondered for a moment and said, "Then what means can be used to find these old cases?"

It's not that he didn't hear Jiang Yuan's suggestions, but Jiang Yuan's suggestions were obviously out of his investigation range.

Jiang Yuan was actually not sure, but after solving so many cases, he had long been confident and said naturally: "First, sort out these cases, and then look for similar ones."

The workload of this job is naturally not small, but Gao Changjiang is not short of people now.

He just said with some regret: "I originally hoped to use technical means to quickly solve this case."

"In the process of sorting out the cases, everyone's technology will definitely be used." Jiang Yuan said whatever he wanted. After all, he was in a strange city in the neighboring province. He was neither working under Gao Changjiang nor sold to Gao Changjiang, so he was full of confidence.

Gao Changjiang looked at the other experts and saw that no one had any objections. He simply nodded and said, "Then go back and sort out the cases. What do you need?"

"Find some experienced police officers and find out all the missing cases and abduction cases in the province and the surrounding areas in the past two years." Jiang Yuan felt like he had taken over the investigation.

This was also a habit. He had a high status when he was in Ning County. After being sold to Changyang City, there was a separate team to deal with the accumulated cases. He basically formed the habit of commanding and giving orders.

In contrast, other experts, although they have been famous for a long time, are more inclined to provide technical support rather than commanding the investigation because of their single technology and technical advantages accumulated over many years.

Gao Changjiang hesitated for a moment, but still did what Jiang Yuan said. It was originally a newly determined investigation plan, plus the title of an expert sent by the ministry-although he was the director of the Municipal Bureau, Gao Changjiang had not actually done many cases listed by the ministry.

So, everyone turned back and deployed personnel at the same time to start screening cases at night.

The eight people brought by Jiang Yuan became more familiar with this model, and began to help each other, as if they had formed small groups commanded by Jiang Yuan.