Chapter 847

The dilapidated factory building.

No windows, no doors, no machines, no roof, no floor, dirty and dark like a black plum, lying across a small hill. There is a road up the mountain and a slope down the mountain, with escape routes in all directions. It really looks like a place suitable for drug lords to meet.

Jiang Yuan put on shoe covers, foot covers, and a hairnet at the entrance. He first poked his head into the factory door to look, then circled the factory once before returning to the main entrance. Then, without hesitation, he activated the skill "Temporary +1" and pointed it at 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 technique of crime scene investigation.

Because what he is looking for is not someone's footprints or fingerprints; his mission is to prove that there are no footprints or fingerprints of a certain person here.

That is, to prove "nothing."

"Proving nothing" is much harder than "proving something."

In some other fields, this could even be considered a request to make trouble out of nothing, completely reaching the level where one should call the police.

But in the eyes of police officers doing criminal investigation or criminal science, "proving nothing" cannot be called a daily occurrence, but it is also a common thing.

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

"No" criminal event, "no" criminal motive, "no" illegal income, etc. The requirements for proving "nothing" are actually very numerous.

Therefore, from the perspective of investigation, using the method of proving nothing to prove that Feng Shui Master is Huang Shuijing has a very good basis for understanding for the police.

It's just that the theory is easy to solve, but the practice is difficult.

The factory area is over 5,000 square meters, and there is a mezzanine in the middle, about 300 to 400 square meters, which was used as an office in the past—according to Feng Shui Master's confession, Huang Shuijing was standing at the mezzanine position that day, talking to himself standing in the factory.

However, to prove nothing, just dealing with a second-floor mezzanine is absolutely not enough. For such a big case, it doesn't even need to reach the death penalty review; the requirements for evidence at the court stage will be very strict. One must also guard against the criminal suspect changing their statement, saying they remembered wrong, made a mistake, or were misled, etc. The prosecution would be dumbfounded, and the police would still not be able to avoid supplementary investigation.

The key is that some investigations cannot be supplemented. If key evidence is missing so severely that you cannot prove A is B, the trial will be very difficult to proceed.

Therefore, Jiang Yuan's mission is to determine all the footprints and fingerprints in this 5,000-square-meter dilapidated factory, then classify and identify them, and then prove that there is no third person, or rather, no thirtieth person present.

Turning around, Jiang Yuan faced the 17 criminal science personnel he had specifically asked for and said: "Everyone already knows the content of the mission. I don't need to emphasize the difficulty and importance of the mission. Here, I want to clarify one point. The 17 technical police officers present today are exactly seventeen. Does everyone know why it is seventeen people?"

The technicians, wearing white coats, carrying green military bags, and shivering in the wind, gave a small but full amount of attention.

"You are all people I called one by one, specifically asking for you to come. You are all trace examiners above the standard level. You can consider this my personal certification. In terms of trace examination technology alone, especially in crime scene investigation, I believe everyone's level is elite." Jiang Yuan determined this according to the level of LV2 or above.

When he does cases in various places, what he comes into contact with most is trace examination. LV2 trace examination technology is not particularly strong, but in any unit, a trace examiner of this technical level is already a solid elite in a city, and can even be said to be the top technical talent in a city.

Stronger and more powerful LV3-level technicians are either long-famous experts or rising stars. Jiang Yuan actually also called 5 technicians who can reach LV3 in crime scene investigation this time, but they are all technicians with severe partiality. The stronger ones basically won't do such basic work anymore, and it's unlikely they would be called to do such elementary work.

Even so, the 17 technicians present were also sizing each other up.

"My personal certification" seems like a joke, but in terms of Jiang Yuan's status in the criminal investigation field in Shannan Province today, if he farts, there is the qualification to collect it and put it into a gas chromatography-mass spectrometer.

Since ancient times, there is no first in literature and no second in martial arts. Many technicians stay in small places and claim to be kings, and they have also cultivated a sense of arrogance.

At this moment, although some people recognized acquaintances, it is not necessarily that everyone would agree that everyone's strength is equal. This is like 90% of people thinking they have above-average looks; most technicians also think their technology is above average, and those with a little level will think their technology is top-notch.

"Next, when everyone is doing the on-site investigation, you must be very careful and cautious. In addition, if you have the spare capacity, you can observe the technical level of the people around you. You can also identify how Jiang Yuan's certified level is." Jiang Yuan smiled when he said this and added: "Of course, because of some trace examiners' working hours and the nature of their work, I couldn't invite all the elite trace examiners, but you are the essence of half of the trace examiners in our Shannan Province."

"Is it the feeling that if a shell hits, Shannan trace examination will retreat three years?" Li Rui, who was standing in the front row, often chatted with Jiang Yuan in the group and joked slightly casually.

Jiang Yuan shook his head: "At least ten years of retreat. The case-solving rate in some cities might fall by more than 30%."

Many of the trace examiners present showed expressions of deep agreement.

Just like the two trace examiners in Ningtai County, Old Yan and Wang Zhong, who don't even have LV2 combined, many districts and counties, because of luck, have obtained or cultivated an LV2 trace examiner, and the case-solving rate can basically be guaranteed.

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

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

Jiang Yuan held yellow and red markers and placed them along the factory building.

The signs are just ordinary ones placed next to the evidence to indicate the serial number of the evidence, starting from 001 all the way up.

Jiang Yuan placed a sign, and the photographer behind him would take a set of photos.

Then, the subsequent technicians entered to extract evidence and conduct detailed investigation.

Jiang Yuan did not place signs for every footprint or trace. He only placed red signs for those within the last three months, and yellow signs for evidence within half a year. Theoretically, if Huang Shuijing left traces, they should also have been left during this period.

Of course, footprints and traces with the time factor added have their difficulty coefficient raised by another level, which is Jiang Yuan's LV6 crime scene investigation, and LV5 footprint analysis, which can be covered relatively easily.

Actually, without the temporary +1 skill, the dual LV5 skill is no problem to scan a factory building, it's just a matter of spending more thought and time. But if it were dual LV4, it might be necessary to scan very seriously and carefully, and the time spent might be several times longer to achieve the same accuracy. Single LV4 is relatively reluctant, and it might be necessary to expand the scope to cover all the required footprints.

As for the dual LV3 skill, it is probably not easy to add the time factor. It is appropriate to pull out all the footprints in the entire factory building. Scanning the factory building can be clean, but the subsequent confirmation of footprints becomes investigation, which costs a lot and has poor results.

But no matter what, for this mission, as long as it reaches LV4 crime scene investigation, there is no problem, and even LV3 can do it, it's just that the resources soar to the level of Asia's Xu Taining.

As for other footprint traces, they are extracted and investigated by other trace examiners, and there will be no problems. LV2 crime scene investigation, facing specific traces, is definitely enough. Not very special traces, discovery and extraction, all belong to basic operations.

And the 17 trace examiners other than Jiang Yuan, just as Jiang Yuan said, while conducting detailed investigation, were all carefully observing the actions of others.

Most of the people here know each other or have heard of each other. However, trace examiners at the LV2 level are actually relatively rare to flow between cities.

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

However, other coordinated actions rarely put so many trace examiners in the same area like an exam, doing similar work.

Technicians who claim to be kings in their respective districts and counties on weekdays, how can they bear to compare with others.

Correspondingly, knowing that they are being commented on by other technicians, how can they easily relax.

The 5,000-square-meter factory building was scanned inch by inch, and the traces scanned out were not few.

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

Huang Shuijing is a determined person, with a relatively determined height, a relatively determined age, plus weight and health level within the standard range, which actually excludes most homeless people, drug addicts, or adventure campers.

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

The mezzanine only had half a staircase left without a ladder, and one had to jump to climb up.

Seeing this, Jiang Yuan was already more than half relieved.

After the signs that should be placed were placed, the photos that should be taken were taken, and Jiang Yuan personally took a few traces, he climbed onto the mezzanine with his hands and feet.

Turning on the headlamp and scanning it once, Jiang Yuan waved his hand again and shouted: "Light!"

A trace footprint search light was hoisted up. Jiang Yuan searched on the ground for a while and said with certainty: "No near-new footprints."

Yes, on this mezzanine, no one has come up recently. That is to say, Feng Shui Master's statement about his meeting and dialogue with Huang Shuijing in this factory does not exist.

Although this is still a distance from proving that Feng Shui Master is Huang Shuijing, criminal investigation is not purely science.

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

On the phone, one could hear Song Beishou's joyful laughter.

"Good, good, good. Then I'm relieved, I'm relieved." Song Beishou put down his mobile phone, and his eyes were already narrowed.