National Forensic Doctor

A tall detective sneaked in through the back door.

The Qinghe Bureau's small lecture hall is one and a half floors high, and there is a special fire escape at the back door. Not many people are willing to use it.

But today, in order to get in during class and because they were embarrassed to come in in front of everyone, many people chose to go through the back door.

Many of them numbered about twenty or more.

After all, there are almost one squadron of manpower.

If so many people illegally used the back door, it would take a large team of people to catch them all.

At this moment, the one who was trying to get through the back door was Chen Wenming, the leader of the Trace Inspection Team of the Criminal Division of Qinghe Bureau. He also received Cao Keyang's text message, so he couldn't help but come over to take a look.

The Qinghe Bureau itself does not handle cases. The criminal police detachment under its jurisdiction usually does the most work, which is to guide the criminal police teams in various places, collect statistics on various indicators and figures in various places, formulate various work requirements, serve the grassroots, upload and issue reports, etc... In this environment, the role of the criminal science unit is more easily highlighted.

For example, the Criminal Division Brigade that was originally supposed to be established by the Qinghe Bureau was transformed into a more professional Criminal Division. The tide has risen, and there is also a trace inspection team.

Some county bureaus cannot or cannot perform technical inspections well, so they send them to the county bureau's criminal department center for inspection. For example, Ningtai County does not have its own document inspection. In terms of mark inspection, the ability to inspect tools is also very weak, and the ability to inspect firearm traces is basically non-existent.

Also missing is footprint inspection. At least in the past, Ningtai County's footprint inspections were all sent to the Qinghe Bureau.

Chen Wenming is the footprint inspector of the Qinghe Bureau and a well-known footprint expert in the province.

Previously, the person who made mistakes in height in Jiang Yuan's footprint case was footprint expert Chen Wenming. Chen Wenming naturally heard about this.

This made him subconsciously avoid Jiang Yuan's training class.

It wasn't until Jiang Yuan's "actual combat" story of doing fingerprints at the scene came out that Chen Wenming came over to watch the battle.

He is a well-known footprint expert in the municipal bureau, but as a trace inspection technician, he can also do fingerprints. Moreover, Chen Wenming's fingerprints are also quite good, but he just doesn't have enough to participate in the provincial fingerprint competition.

It is also because of this that Chen Wenming always felt that Jiang Yuan's "practical lessons" were a bit too gimmicky. Chen Wenming stretched his head and looked down, and saw Jiang Yuan looking at the screen without even looking at himself. There were about 50 or 60 people sitting in the small lecture hall with a capacity of 1,780 seats. Less than half of them do not need to attend training courses.

Chen Wenming curled his lips, then found the location of Cao Keyang, who was in the same group, and groped over.

After a break, Cao Keyang had retreated to the middle position, but his eyes were still a little blurred, and his mood was still a little sad. The emo guy was too lazy to wait on Jiang Yuan.

"How is it?" Chen Wenming sat next to Cao Keyang and asked in a low voice. Cao Keyang laughed twice and said, "Now it's time to mark the fifth feature point." "So you marked it four times and still didn't win?" Chen Wenming couldn't help laughing.

Marking feature points four times is actually not much. Generally, if the fingerprints collected on site fail to match, they will be marked at least three or four times, and they will be given up after four or five times.

If it is an important murder case, it is normal to mark it more than ten times or more than twenty times.

The number of times the backlog is marked is even greater. Most of the trace inspections and fingerprints are done through tests. This is the most normal approach.

But in terms of psychological feeling, if you mark four times and still fail to win, you feel that the probability of winning again is not high.

Instead, it was Cao Keyang who spoke for Jiang Yuan and said, "Because I chose difficult fingerprints, so in the previous class, it was abnormal to get the right mark four times."

"Normally, fingerprints would not be compared on the spot like this." Chen Wenming frowned and said, "Fingerprint comparison itself is somewhat accidental."

Cao Keyang nodded immediately: "Yes, I think so too."

"It's common for fingerprints to fail to match. No matter how well the fingerprints are marked, if there are no corresponding fingerprints in the library, what can you do?" Chen Wenming sighed.

"Yes, yes." Cao Keyang agreed.

"This kind of on-site fingerprint comparison can easily give everyone a bad impression, as if fingerprint identification is something that can produce results in minutes." Chen Wenming sighed again and thought to himself, if it hadn't been for the last footprint, You have to speak up for yourself.

However, it was precisely because of Jiang Yuan's footprint identification not long ago that he overturned Chen Wenming's own footprint identification and thus solved a murder case. Chen Wenming felt that it was difficult for him to educate Jiang Yuan.

Educating him now seems like he has no tolerance for others.

Chen Wenming looked at the screen with a hint of regret and regret, as well as a hint of helplessness and exhaustion.

It is easy for young people to take the wrong path in the midst of honors and applause. This is not a big deal at first. People always have to go through something to grow...

"I didn't win this time either." Jiang Yuan's voice came from the lecture hall. Chen Wenming unconsciously pursed his lips.

It was expected.

No matter how good a fingerprint expert is, the probability of matching the fingerprint is not high. This can be seen by looking at the fingerprints of suspects that are constantly accumulating in the fingerprint database. If the fingerprints were so similar, there would be no fingerprints in the fingerprint database.

Today's criminals, even the smarter ones, know how to hide their fingerprints.

The era of bloody fingerprints everywhere, like thirty or forty years ago, is long over.

Of course, every step of the way is better than magic, and fingerprint extraction technology is constantly improving.

Technologies such as extracting fingerprints from plastics and extracting fingerprints from fabrics are now very mature. However, the fingerprint conditions extracted from these places are not much better.

If you want to match these fingerprints, the difficulty has increased no matter how many times.

Therefore, no matter which angle he analyzes it from, Chen Wenming does not think that "practical" lectures are an option. At this time, Jiang Yuan's voice came again: "Let's mark the feature points again."

Chen Wenming then adjusted his seat and prepared to take a good look.

Then, Jiang Yuandao said: "Marking feature points, especially marking feature points multiple times, we must learn from previous markings. So what have we learned from previous marking of feature points?"

Chen Wenming was stunned for a moment, and he couldn't help but feel surprised: Can you still think like this?

Jiang Yuan continued in a teaching tone, saying: "Look at the several feature point markings I made before, it is easy to see that the middle part has been marked in the many feature point markings, because here The conditions are relatively good and it’s easy to find feature points, right?”

Some people in the venue nodded cooperatively.

Jiang Yuan said again: "If it is an ordinary fingerprint, there is no problem with our previous marking mode. It must be marked well. However, we have failed to mark many times now. I think we need to reconsider the characteristic points. mark range."

Jiang Yuan used his mouse to draw a circle on the fingerprint and said, "We have marked the characteristic points here many times before, and the matched fingerprint conditions are also average. So this time, we will not mark the characteristic points in the circle. ”

"It's a little difficult. In this case, the difficulty will be increased a lot, but from my understanding, increasing the difficulty is actually a prerequisite for winning the fingerprint. Curry's difficult fingerprint, the more difficult it is, the easier it will be. Match."

The principles explained by Jiang Yuan have little impact on newcomers to trace inspection.

Half of the people here usually focus on collecting fingerprints, and have never compared fingerprints in the fingerprint library. Now that it is easier to compare with the difficulty, and the inner meaning of it, it is somewhat beyond the scope of understanding.

Chen Wenming listened immediately.

His fingerprint level is not very high, but his footprint identification level is indeed top-notch in the province. In his daily work, Chen Wenming has actually discovered this truth long ago.

The footprints involved in the backlog of cases, especially the footprints involved in major and important cases, are simpler and more routine, and the more difficult they are to match.

If you think about it carefully, if such a footprint can be compared, why did the previous trace inspection leave the footprints until this moment? It has to be a difficult footprint, which is easier to hit.

Especially for tracks that are beyond the range of most people, once the entry point is found, the probability of hitting is ridiculously high. From a certain perspective, this is equivalent to coming up with new technology.

New technologies are used to combat criminals, resulting in an "easier to hit" situation. Chen Wenming nodded slightly again.

It is true that in a footprint appraisal, people who accidentally defeat themselves can really sum up something. As for specific abilities...

"This time the difficulty is higher, so I marked it first because the method used is quite special and not very reference..." Jiang Yuan's voice was slightly soothing, but he still operated while talking.

Chen Wenming stared at it for a while and found that it was a very special method—because he had never seen it before. Chen Wenming couldn't help but ponder.

His level is still different from other trace inspections below, so he naturally does not belong to the group that Jiang Yuan said is too difficult.

However, before Chen Wenming could figure it out, Jiang Yuan had already marked a dozen characteristic points along the way.

"Let's run it again and take a look." Jiang Yuan completed the mark and threw it into the software. He even had time to take a sip of tea.

Chen Wenming frowned and looked, and saw 20 similar fingerprints popping up. Jiang Yuan still watched at a fast speed.

It didn't take much time to look at a dozen fingerprints in a row.

Chen Wenming was already a little impatient. It could be said that giving lectures like this was not attractive at all.

He turned to look behind him, and unexpectedly discovered that a group of guys who usually didn't take part in the training seriously were actually looking at it very seriously at this time.

Chen Wenming was thinking, since when did trace inspection become a spectacle? Even if it attracts everyone's attention, how can it last...

"We won the competition." Jiang Yuan's clicking sound stopped at some point. Chen Wenming quickly raised his head.

Jiang Yuan added: "This is another fingerprint connected to a backlogged case. Well, these two fingerprints should be identified as the same, and then the case can be handled together."

Merger means the possibility of bringing more clues. For the detection of the case, it is always beneficial. Then, Jiang Yuan began to fill in the appraisal report with the same certification.

Some policemen were already shouting from below: "Look at the case."

"Call."

Jiang Yuan also had a smile on his face. He waved his hand at the lecture table and said, "Don't make the call right now." After writing the appraisal report, he opened the case.

One was a burglary and the other was a burglary. Chen Wenming's eyelids suddenly twitched.

These two cases are quite heavyweight.

Jiang Yuan also looked at it carefully for a while, and then said: "The two cases are quite serious, so let's do it differently."

So, Jiang Yuan used Photoshop.