Chapter 867 Fish in the Pond

A dilapidated factory building.

There were no windows, no doors, no machines, no ceiling, no floor, and it was as dirty as a black plum lying on a hill. There are roads up the mountain, slopes down the mountain, and escape routes in all directions. It really looks like a place suitable for a meeting with a drug lord.

Jiang Yuan put on shoes, foot covers and headgear at the door. He first stretched his head into the factory door to take a look, then walked around the factory once again before returning to the door. Then he activated the skill "Temporary +1" without hesitation. , and pointed out to crime scene investigation (LV5).

This mission is not simple at all. It can even be said to be Jiang Yuan's biggest challenge in the crime scene investigation technology.

Because what he is looking for is not actually someone's footprints or fingerprints, his task is to prove that there is no one's footprints or fingerprints here.

That is to prove "nothing".

"Proving that there is no" is much more difficult than "proving that there is".

In some other fields, this could even be considered a request to make trouble out of nothing, to the point where the police should be called.

However, in the eyes of police officers engaged in criminal investigation or criminal division, "no evidence" cannot be said to be a common occurrence, but it is also a common thing.

For example, the basic requirement for evidence in criminal cases is to "beyond reasonable doubt." This is actually the fundamental requirement of the Criminal Procedure Law to prove "no" and "reasonable doubt."

"No" criminal incident, "no" criminal motive, "no" illegal income, etc. There are actually many requirements for various types of "no" certificates.

Therefore, from an investigation point of view, using evidence to prove that Mr. Feng Shui is citrine is a good basis for the police to understand.

It's just that it's easy to understand in theory, but difficult to implement in practice.

The factory building covers an area of ​​more than 5,000 square meters, with a mezzanine in the middle. An area of ​​about three to four hundred square meters was used as an office in the past. According to the Feng Shui master's instructions, Citrine was standing on the mezzanine that day, just like in the factory. of self-conversation.

However, if you want to prove that there is no such thing, simply building a second-floor mezzanine will definitely not work. Such a big case does not require a death penalty review. The requirements for evidence at the court stage will be very strict. The prosecutor must also be careful to prevent the suspect from retorting, misremembering a sentence, making a mistake, or being misled. Dumbfounded, the police still had to conduct additional investigations.

The key is that some investigations cannot be supplemented. If the key evidence is so missing, you will not be able to prove that A is A, and it will be difficult to proceed with the trial.

Therefore, Jiang Yuan's task is to identify all the footprints and fingerprints in this 5,000-square-meter dilapidated factory building, and then classify and identify them, thereby proving that there is no third person, or in other words, the thirtieth person at the scene.

Turning around, Jiang Yuan faced the 17 criminal department personnel he had named and said: "Everyone already knows the content of the task. There is no need for me to emphasize the difficulty and importance of the task. Here, I want to explain one point. There are some 17 technical police officers present today. Do you know why there are 17? "

The technicians wearing white coats and carrying green army bags, standing shivering in the wind, paid a little but full attention.

"I called you one by one and asked to come over by name. They are all trace inspections above the standard. You can think of them as my personal certification, Jiang Yuan. In terms of trace inspection technology alone, especially in crime scene investigation, I think your level is They are all elite level. "Jiang Yuan is determined based on level above LV2.

When he was doing cases in various places, what he came into contact with the most was trace inspection. LV2's trace inspection technology is not particularly strong, but within any unit, trace inspection with this technical level is already a city's elite, and can even be said to be a city's top technology.

Stronger and more powerful LV3 technicians are either long-established experts or emerging stars. This time, Jiang Yuan actually found five technicians who could reach LV3 in crime scene investigation, but they were all the kind of technicians who were more partial to the subject. The stronger ones would basically not be able to do such basic work again, and it was unlikely. I was called to do such an entry-level job.

Despite this, the 17 technicians present looked at each other.

"My Jiang Yuan's personal certification" may seem like a joke, but considering Jiang Yuan's current status in the criminal investigation field of Shannan Province, he is qualified to collect and enter the gas chromatograph mass spectrometer even if he farts.

Since ancient times, there is no first in literature and no second in martial arts. Many technicians stay in small places and dominate, and they also develop a sense of arrogance.

At this moment, although some people recognized acquaintances, it may not be recognized by everyone if they are of equal strength. This is just like 90% of people think that their appearance is average to above average, and most technicians also think that their skills are average to above average. Those with a little bit of skill will think that their skills are top-notch.

"Next, everyone must be very careful and cautious when doing on-site inspections. In addition, if you have spare time, you can observe the technical level of the people around you. You can also make an appraisal. Jiang Yuan certified What's the level?" Jiang Yuan smiled at this, and then said: "Of course, due to the working hours of some trace inspections and the nature of the work, I haven't been able to invite all the elite trace inspections, but everyone, just Half of the essence of our Shannan Province trace inspection is there.”

"Is it the feeling that one cannonball hits Shannan's trace inspection and sets it back three years?" Li Rui, who stood in the front row, often chatted with Jiang Yuan in the group and joked casually.

Jiang Yuan shook his head: "At least ten years will be lost. The crime-solving rate in some cities may drop by more than 30%."

Many of the trace investigators present showed deep agreement.

Just like the two trace investigators in Ningtai County, Lao Yan and Wang Zhong, who are not LV2, many districts and counties, due to luck, have obtained or trained a LV2 trace investigator, and the crime-solving rate can be basically guaranteed.

But this kind of thing, leaders understand, police understand, technicians understand, but the technicians understand, but it is useless for the police to understand, and leaders pretend not to understand, and they are all doing things in a muddle.

Jiang Yuan waved his hand and walked into the factory first.

Jiang Yuan held two yellow and red signboards and placed them along the factory.

The signboard is just placed next to the evidence to indicate the serial number of the evidence, starting from 001 and going up.

When Jiang Yuan puts a signboard, the photographer behind him will take a group of photos.

Then, the subsequent technicians will enter the scene to extract evidence and conduct detailed inspections.

Jiang Yuan did not put a sign on every footprint or trace. He only put a red sign on the evidence within the past three months and a yellow sign on the evidence within half a year. In theory, if there are traces left by the yellow crystal, they should be left during this period.

Of course, the difficulty coefficient of the footprint traces with the time factor is increased by one level, that is, Jiang Yuan's LV6 crime scene investigation and LV5 footprint analysis can be covered more easily.

In fact, without the temporary +1 skill, it is no problem to scan a factory with double LV5 skills, but it takes more time and effort. But if it is double LV4, it may be necessary to scan it very carefully and meticulously, and it may take several times longer to achieve the same accuracy. Single LV4 is more reluctant, and it may be necessary to expand the scope to cover all the required footprints.

As for the double LV3 skills, it is probably not easy to add the time factor. It is appropriate to pull out all the footprints of the entire factory. Sweeping the factory can be swept clean, and the subsequent confirmation of footprints becomes an investigation, which costs a lot and has poor results.

But no matter what, as long as the mission reaches the LV4 crime scene investigation, there will be no problem. Even LV3 can do it, that is, the resources soar to the level of Yaxu Taining.

As for other footprints, there will be no problem if they are extracted and investigated by other trace detectives. LV2 crime scene investigation is definitely enough for specific traces. If the traces are not very special, finding and extracting them are all basic operations.

And the 17 trace detectives other than Jiang Yuan, as Jiang Yuan said, are carefully observing the actions of others while conducting detailed investigations.

Most of the people here know each other or have heard of each other. However, LV2 level trace detectives are actually less likely to move out of the city.

Their level is strong enough, and they are undoubtedly the backbone of the city and county level, but when it comes to supporting other cities and counties, most of them are coordinated and unified actions by the province, just like Jiang Yuan’s request this time.

However, other coordinated actions rarely put so many trace detectives in the same area, like exams, to do similar work.

How could the technicians who usually dominate their respective districts and counties resist comparing themselves with others?

Correspondingly, knowing that they are being criticized by other technicians, how could they easily relax?

The 5,000-square-meter factory was swept inch by inch, and there were many traces.

The most traces here are actually traces of homeless people, and maybe some young people who come to play. But from Jiang Yuan's understanding, these have no big impact.

Huang Shuijing is a certain person, with a relatively certain height and a relatively certain age. In addition, the weight and health level within the standard range have actually ruled out most of the homeless, drug addicts or adventure campers.

Jiang Yuan placed yellow and red cards one by one, and walked much faster than others. In just over an hour, he arrived at the mezzanine.

The mezzanine only had half a staircase without an escalator, and he had to jump up.

Jiang Yuan was relieved when he saw this.

After the signs were put up and the photos were taken, Jiang Yuan personally took a few traces and climbed up to the mezzanine with his hands and feet.

Turning on the headlight and scanning, Jiang Yuan waved his hand and shouted: "Light"

A trace shoe print search light was hoisted up, and Jiang Yuan searched on the ground for a while, and said with certainty: "There are no recent footprints."

Yes, no one has come up to this mezzanine recently. In other words, the meeting and conversation between Feng Shui and Huang Shuijing in this factory did not exist.

Although this is still a little far from proving that Feng Shui is Huang Shuijing, criminal investigation is not pure science.

Jiang Yuan called back from the mezzanine and repeated the situation to Song Beishou in a few words.

Song Beishou's delighted laughter could be heard on the phone.

"Okay, okay. Then I'm relieved, I'm relieved." Song Beishou put down his phone again, his eyes narrowed.