civil forensic

Chapter 13
"exclude."

"exclude……"

Jiang Yuan clicked the mouse from time to time to delete the fingerprints he had seen from the list.In this way, in the next wave of matching, the fingerprints given by the software will not be repeated.

Still, the complexity of fingerprint matching remains unchanged.

Every time Jiang Yuan re-marks the feature points, he has to re-read 150 fingerprints, with an average of 30 seconds to read one fingerprint, and it takes an hour to read a set of fingerprints.

This is also caused by the complexity of fingerprints.If you have irrelevant fingerprints, you can turn the page at a glance, but the fingerprints matched by the computer have a relatively high degree of similarity, and it takes a little effort to eliminate them.

However, the fingerprint matching job is like this, especially the difficult fingerprints, always hovering between "Are my feature points marked correctly" and "Is there this fingerprint in the fingerprint database?"

Jiang Yuan was no exception. When he was fine-tuning the fingerprint for the fourth time, he stopped involuntarily.

"It should be adjusted to a larger one." Jiang Yuan burst out this idea unconsciously.

Originally, he made fine-tuning within the range of 20%. However, as more and more fingerprints were excluded, by the time of the third 150 fingerprints, the matching fingerprints given by the system were already very exaggerated. Many fingerprints were detected by human eyes. Looking at it, it looks completely irrelevant—the fingerprints after two deformations can't be expected to be sorted accurately by the system, otherwise, Jiang Yuan wouldn't need to sort 150 fingerprints.

But at this time, Jiang Yuan thought of other colleagues.

They must also know how to fine-tune. Moreover, in terms of patience, the policemen who do fingerprint posts are not weak. What is it to look at fingerprints for several hours? Experts can see 15+ fingerprints, and it is normal to see thousands of fingerprints for one case.

Jiang Yuan moved his fingers slightly, and slowly indented the suspect's fingerprints by 30% towards the middle.

This figure must be an exaggeration. Normal deformation cannot be changed to this extent. However, considering the 150 candidate fingerprints, the probability of the second half is already low to a certain extent. Jiang Yuan decided to choose a normal fingerprint expert. The ratio will not be selected.

Of course, the 30% was not drawn casually, and Jiang Yuan still edited with reference to the more stable area in the middle.

After quickly marking the new feature points, Jiang Yuan clicked OK again, waited for a while, and saw the refreshed candidate inspection list.

Still looking from top to bottom, as expected, the similarity of the fingerprints in the front is extremely insufficient.

Jiang Yuan quickly clicked on "Exclude" to swipe down.Because he had seen it many times, the suspect's fingerprints were firmly in his mind, and he could make a judgment just by looking at the matching fingerprints on the right.

If it is said that multiple considerations are required to prove the comparison, it is relatively simple to prove the exclusion. As long as there are obvious similarities and differences, then you can point to exclusion.

This time, it took only 10 minutes for Jiang Yuan to get the 90th fingerprint.

At the moment when he habitually clicked the right button, Jiang Yuan paused.

The 91st fingerprint, the upper middle part, gave Jiang Yuan a sense of deja vu.

Jiang Yuan sat up a little bit more and checked it more carefully.

The degree of difference between two fingerprints can be large or small.In fingerprint identification, to identify the identity, first, there must be 8 or more characteristic points that are the same, and second, there must be no similarities and differences, or the similarities and differences can be explained.

As far as Jiang Yuan's current fingerprints are concerned, it is very difficult to achieve the two criteria for identifying the same, but if you count the fingerprint correction part, you can make up eight—after all, it has been achieved.

Jiang Yuan swiftly uploaded the finished picture, wrote down the identification statement that it was identified as the same, clicked OK, and then let out a long sigh of relief.

It really hit the mark.

Moreover, in the 91-bit ratio of a set of candidate fingerprints, this low probability of success brings a great sense of accomplishment.

Jiang Yuan leaned against the back of the chair, picked up the glass, gulped down the full glass of water, felt refreshed as if he drank a whole bottle of cold beer in three or nine days, his forehead was still cramping, and he was properly overusing his brain status.

"There are results?" Wu Jun looked over from the opposite side of the office, looked at Jiang Yuan's appearance, and guessed.

Jiang Yuan smiled triumphantly, and then said modestly: "I just uploaded it, and I still have to wait for experts to verify it."

"Then there is a high probability." Wu Jun was really surprised, he looked at Jiang Yuan again after he collected his mind, and said, "Actually, this case is our county's own. You have won the match, so report it directly to Captain Huang That’s it, no need to go through expert verification.”

"Check it out, don't worry, the fingerprints are seriously deformed." Jiang Yuan paused, then smiled: "I'm not in a hurry for this day."

"It's true." Wu Jun said with emotion: "If you win the competition this time, it means you have directly solved a serious injury case."

Jiang Yuan smiled obediently.

Although the quality of the intentional injury case cannot be compared with the homicide case, it is also one of the eight major serious cases in the criminal law. In addition to the elements of the backlog, any police cracked such a case, at least for a few months, must be in the criminal police team. The prettiest boy.

Wu Jun himself is just an ordinary forensic doctor. Relying on his rich experience and the only label in the county, he has also had a bright moment, but looking at Jiang Yuan at this time, he still can't help but feel envious—if he could With this level of technology, you can still grow so tall. Why don't you marry a wife who doesn't swear or beat people, doesn't need a salary card, cooks delicious food, and is willing to clean?

"Let's go home." Wu Jun looked at the time and got up in a dispirited manner.

It was already 06:30 in the evening, and the normal off-duty time had passed, but on the floor of the Criminal Division Squadron, the policemen in various offices were still working silently.

The two people who came out of the medical examiner's office looked at each other, and tiptoely locked the door.

"There is no body, so I can only get off work. I have to go back to do the laundry today." Forensic Doctor Wu walked lightly and spoke in a low voice.

Jiang Yuan nodded and said, "I'll go back to eat."

"Shh." Wu Jun dragged Jiang Yuan down the stairs, and then chatted in a relaxed mood: "What kind of table are you eating?"

"Uncle Seventeen's table." Jiang Yuan glanced back at Wu Jun and invited, "Do you want to go?"

"Where am I going...it's Uncle Seventeen..."

"You cut it."

"That's also..." Wu Jun was speechless, and said for a long time: "I have been a forensic doctor for half my life, and this is the first time I have been invited by a client."

"go?"

Wu Jun shook his head helplessly, opened his pocket and said, "Help me with someone, just take a pack... half a pack of cigarettes. Just give him some."

Jiang Yuan took the half package of Yuxi from Wu Jun, waved his hand, went to the parking spot, and rode his electric car home.

(End of this chapter)