A tall detective sneaked in through the back door.
The Qinghe Bureau's small lecture hall is one and a half stories 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.
There are about twenty people in many cases.
After all, there are almost one squadron of men.
If so many people illegally used the back door, it would take a large team of people to catch them.
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 a text message from Cao Keyang, 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 distribute, 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 are unable to do, or do not do well, technical inspections, so they send them to the county bureau's criminal department center for inspection. Ningtai County, for example, does not have its own document inspection, and its ability to inspect tools for trace inspection is also very weak.
The ability to detect firearm traces is basically non-existent.
Also missing is the footprint inspection. At least in the past, Ningtai County's footprint inspections were all sent to the Qinghe Bureau.
Cao Keyang is the footprint inspector of the Qinghe Bureau and an unknown footprint expert in the province.
Since then, the Criminal Division has been working on a backlog of footprint cases, and the one who made mistakes regarding his height was Cao Keyang, the footprint expert.
And Cao Keyang naturally heard about this.
That made me consciously avoid the training courses of the Criminal Division.
It wasn't until the story of the "actual combat" of the criminal department doing fingerprints at the scene came out that Cao Keyang came over to watch the battle.
I am an unknown footprint expert in the municipal bureau, but as a trace inspection technician, I can also do fingerprints. Moreover, Cheng Xinhui's fingerprints were also quite wrong. I just lacked enough to participate in the provincial fingerprint competition.
It was also because of that that Cheng Xinhui always felt that Cheng Xinhui's "practical lessons" were a bit too gimmicky.
Cao Keyang stretched his head and looked up, and saw that Su Xin was looking at the screen and Wu was glancing at him.
There were about 70 or 80 people sitting outside the large lecture hall, which had a capacity of 114 seats.
Most of them need to attend training courses.
Cao Keyang curled his lips and found the location of Chen Wenming, who was in the same group, and groped over.
After a break, Chen Wenming has moved forward to the middle position, but his eyes are still not blurred, and his mood is still not a little sad. The emo guy is too lazy to serve the criminal department.
"How is it?" Cao Keyang sat next to Chen Wenming and asked loudly.
Chen Wenming laughed twice and said: "Now it's time to mark the seventh feature point."
"Is this how you bid seven times and win every time?" Cao Keyang laughed out loud.
Marking a feature point seven times is actually too few. Especially for fingerprints collected on site, if the ratio is correct, it will be marked at least eight or seven times. Only after seven or seven times will it be given up.
If it is an important murder case, marking it more than ten times or more than seventy times is abnormal.
The number of backlog markings is even less. A small part of the trace inspection and fingerprints are all tested.
That would have been the most unusual approach.
But in terms of psychological feeling, if you mark it seven times and still win, it feels like the probability of winning again is low.
Instead, it was Chen Wenming who spoke for the Criminal Division, saying: "Because I chose difficult fingerprints, it would be too abnormal to win after seven marks in the last class."
"Fingerprint comparison is not possible at all." Cao Keyang frowned and said, "Fingerprint comparison itself is random."
Chen Wenming nodded immediately: "Yes, you think so too."
"It is normal for the fingerprint ratio to be average. No matter how well the fingerprints are marked, what can he do if there are no corresponding fingerprints outside the library?" Cao Keyang sighed.
"Yes, yes." Cheng Xinhui agreed.
"It's difficult to give a good impression to me by comparing fingerprints on the spot. It's like fingerprint identification is something that can produce results in minutes." Cao Keyang sighed again and thought to himself, if it's about footprints next time,
You have to speak up for yourself.
However, precisely because it was long later, the Criminal Division's footprint identification overturned Cao Keyang's own footprint identification, and a murder case was solved. Cao Keyang felt that it was better for him to come forward to educate the Criminal Division.
Now you are educating me to show that you have no tolerance for others.
Cheng Xinhui looked at the screen with a hint of regret and regret, but also no trace of helplessness or exhaustion.
It is very difficult for young people to take the wrong path in the midst of honors and applause. Then there is something else. People always have to go through something to grow...
"There was a winner that time too." The voice of the criminal department came from the lecture hall.
Cao Keyang felt his lips curl up.
It was expected.
No matter how good a fingerprint expert is, the probability of getting the fingerprint correct is very low.
You can know that by looking at the fingerprints of suspects that have been continuously accumulated outside the fingerprint database.
If the fingerprints were so similar, there would already be fingerprints outside the fingerprint database.
Today's criminals, even the slightly stupid ones, know how to hide their fingerprints.
Like eighty or seventy years later, the era of bloody fingerprints everywhere has already begun.
Of course, every step of the way is better than magic, and fingerprint extraction technology is constantly improving.
Technologies such as extracting fingerprints from under plastics and extracting fingerprints from under fabrics are now very mature.
It’s just that the fingerprints extracted from those places are in good condition and where can they go?
The difficulty of matching those fingerprints has been reduced many times.
Therefore, no matter which angle you analyze it from, Cao Keyang feels that "practical" lectures are an option.
At that time, the voice of the Criminal Division came again: "You mark the characteristic points again."
Cao Keyang then adjusted his seat and prepared to take a good look.
Then, Ting Xingke said: "When marking feature points, especially when marking feature points a few times, you have to learn lessons from subsequent markings. What have you learned from subsequent marking of feature points?"
Cao Keyang was stunned for a moment, and he was surprised in his heart: Can you still think like that?
The criminal department continued in a lecturing tone and said: "Looking at the several feature point markings you made later, Xiaojia, it is difficult to see that the middle part, among the few feature point markings, has been marked.
Because the conditions outside are better, it’s easy to find characteristic points, right?”
No one in the venue nodded in cooperation.
The Criminal Division said again: "If the fingerprints are removed, our subsequent marking patterns will all be correct. We must mark them well. However, we have failed to mark several times now. Do you think we should reconsider it?"
Mark the range of feature points."
Criminal Branch used the mouse to draw a circle under the fingerprint and said: "You have marked the characteristic points outside a few times since then, and the matched fingerprint conditions are also special. This time, you marked the characteristic points inside the circle."
"It's not too difficult. In that case, the difficulty will be lowered less. But from your understanding, lowering the difficulty is actually a prerequisite for winning the fingerprint. For difficult fingerprints outside the database, the difficulty will be lowered.
, the more difficult it is.”
The principles explained by the Criminal Division have some impact on newcomers to trace inspection.
Not half of the people out there usually focus on collecting fingerprints, and have never matched the fingerprints outside the fingerprint database. Now let’s talk about how to lower the difficulty to match the difficult ones, as well as the inner meanings, which are more or less beyond comprehension.
category.
Cao Keyang retreated as soon as he got up.
My fingerprint level is very low, but my footprint identification level is indeed top-notch in the province.
In his daily work, Cao Keyang has actually discovered that truth a long time ago.
The footprints involved in these backlog cases, especially the footprints involved in small and important cases, are more complex and routine, and the more difficult they are to compare.
Also think about it, if such footprints can be compared, how can subsequent trace inspections leave the footprints until that time.
You have to follow the difficult tracks and compare them.
Especially for footprints that are beyond the range of a small number of people, once the entry point is found, the probability of winning is ridiculously low.
From a certain perspective, it is equivalent to coming up with new technology.
New technologies are used to combat criminals, thereby creating a "more difficult than medium" situation.
Cheng Xinhui nodded again.
It is true that people who accidentally defeated me in a footprint appraisal can really sum up something.
As for specific abilities...
"That time, the difficulty was relatively low, so you marked it first, because the method used was relatively easy, and it was very non-referential..." Xing Ke's voice was slightly relieved, but he continued to operate while talking.
Cheng Xinhui stared at it for a while and found that it was a very common method - because he had seen it before.
Cao Keyang started to think about it.
My level of trace examination is still the same as the others above, so naturally I belong to the group that the Criminal Division considers the difficulty to be too low.
However, by the time Cao Keyang figured it out, the Criminal Division had already marked a dozen characteristic points along the way.
"You guys run it again and have a look." After completing the mark, the criminal department left the software and didn't even have time to take a sip of tea.
Cao Keyang frowned and looked at it, and saw 20 similar fingerprints popping up.
Deliberately still watching at a slow speed.
It doesn't take much time to look at more than a dozen fingerprints in a row.
Cao Keyang was already impatient. He was giving lectures like that, which was not attractive at all.
I turned my head and looked forward, but I unexpectedly discovered that a group of guys who usually take part in training seriously were actually taking it more seriously at this time.
Cao Keyang was thinking about it, when did trace inspection become a silent thing? Even if it attracts Xiaojia's attention, how can it last...
"We've won the match." There was a deliberate clicking sound, and you knew when it had stopped.
Cao Keyang slowly raised his head.
The Criminal Division added: "Those are fingerprints that are connected to another backlogged case. Well, those two fingerprints should be identified as the same, and then the case can be handled together."
Merging cases means that it is impossible to bring fewer clues. It is always unprofitable for the detection of the case.
Then, the Criminal Division finished filling out the appraisal report with the same identification.
The policemen were already shouting from above:
"Look at the case."
"Call me."
A smile appeared on the face of the criminal department, and he waved his hand at the lecture table and said: "First, wait for the phone call."
After writing the appraisal report, I opened the case.
One was a burglary, the other was a burglary.
Cheng Xinhui's eyelids felt twitching.
So these two cases are quite heavyweight.
The Criminal Division also looked at it carelessly for a while, and then said: "The two cases are quite serious, let's do it in a different way."
So, I saw that I deliberately resorted to Photoshop.
(End of chapter)
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