civil forensic

Chapter 6 Fingerprint Identification
The yard of the criminal police team was much deserted than usual.

In a county like Ningtai County with tens of thousands of people, the probability of serious cases is not high. There are ten or eight abnormal deaths throughout the year, which will eventually become criminal cases, which are so-called homicide cases. , It’s about one or two together.

Because of this, even if the case seems to be simple this time, the criminal police team is also in the mode of dispatching all members.

When Jiang Yuan returned to the office, he saw that the fourth floor where the criminal investigation team was located was empty, only the door of the trace inspection office was open, and someone was busy typing on the keyboard inside.

"The report should be more detailed. This case might be punished by death, and the requirements for death penalty verification are very strict." Wu Jun reminded Jiang Yuan, and then said: "We were working on a case back then, and one of the evidences was plastic oil. It has been two years since the case was completed, but we suddenly received a call, asking us why the oil barrel in the photo is white, but the actual evidence is yellow."

Jiang Yuan turned on the phone and listened, and asked curiously, "Why?"

"Why? Because the actual evidence has been stored for a long time, and the plastic is aging. I have to make supplementary materials again." Wu Jun paused, and then said: "I just want to tell you that the verification of the death penalty is stricter than other cases. There are so many, so many pairs of eyes staring at it, it doesn’t hurt to set the standard a little higher.”

"Understood." Jiang Yuan followed good advice, paused for a while, and asked again: "Then my relationship with Uncle Seventeen...do you want to avoid it?"

"Only close relatives are needed." Wu Jun said that close relatives have different scopes in different legal provisions. Among them, the scope of administrative law is the broadest, and the scope of criminal law is the narrowest, only husband and wife, parents, children and siblings.

Jiang Yuan calmed down and worked hard.

Soon, in front of him, a series of photos were carefully arranged.

Uncle Seventeen's intestines, Uncle Seventeen's heart, Uncle Seventeen's brain slices, Uncle Seventeen's stomach contents... Jiang Yuan carefully selected and explained clearly.

For the police, the complexity of handling a case is often far better than solving it.Just like the murder case in front of you, even if the case is simple and clear and the suspect pleads guilty, there are still countless paperwork to be done when the case is handled.

It was almost time to get off work when there was a noise coming from the yard.

Jiang Yuan looked out of the window and saw all three vehicles of the criminal police team parked in. Captain Liu of the Second Squadron was even wearing police equipment, and stood in front of the police car in the middle as if he was facing a formidable enemy.

Aunt Seventeen was thin and handcuffed with dull eyes, and moved down from the back seat.

To be honest, Jiang Yuan has no good or bad memories of Aunt Seventeen.Before taking the public examination, he studied in a medical university for five years in other places. Before the college entrance examination, he studied in a boarding school for three years in high school. The impression of Aunt Seventeen was far less than that of Uncle Seventeen's big belly...

"The suspect identified the murder weapon, which was a chef's knife, and it was thrown into the trash can outside the community." Wu Jun also stood up and looked down, and updated Jiang Yuan's case by the way.

Jiang Yuan let out a sigh of relief.When the case has progressed to this level, the work of solving the case is basically over, especially for those who have discarded the murder weapon and identified them in different places. It is more than ten times more difficult to reverse the case than those who only have confessions.

"What about the abandoned corpse? She can't move it alone." Jiang Yuan asked one more question.

"Her younger brother helped move them, using the tricycles and carts used to transport vegetables in the store." Wu Jun paused, and then said: "I have also been arrested, and I have to explain."

In this way, the material evidence and oral testimony are all complete, and it is basically an iron case.

While thinking wildly, the translucent system interface jumped out.

Task: Do a comprehensive autopsy and assist in the detection of the case

Task reward: Chongqing-style single-fingerprint analysis method - bow pattern identification (LV3).

Jiang Yuan stared wide-eyed, and saw a silver dumpling flying into his forehead.

Numerous information, manic crowding.

The Chongqing-style single-fingerprint analysis method is a kind of single-fingerprint analysis method, and it is also the earliest single-fingerprint analysis method adopted in China. It is specially used to deal with the situation where there is only one fingerprint, or even only one incomplete fingerprint.Similar to it, there are domestic Qingdao-style single-fingerprint analysis methods, foreign Bartley-style single-fingerprint classification methods and other methods.Different analysis methods can't be said to be good or bad. The main reason is that the classification and typing of fingerprints are different, and the analysis methods are slightly different.

Simply put, this is a technique used to compare fingerprints.

Jiang Yuan's eyes brightened slightly. Fingerprint comparison can be said to be the housekeeping skill of trace inspection. Moreover, it is time-consuming and labor-intensive to learn it.

However, comparing fingerprints is not an easy job.

The kind of machine that enters any fingerprint photo into the computer and then crunches to find the matching fingerprint does not exist so far.

Internationally mature automatic fingerprint identification technology (AFIS), regardless of whether it uses RBNEC, American COGENT, or French Morpho, all use manual marking of on-site fingerprint features, which are so-called feature points, and then in the system, fingerprint The feature points are automatically matched and retrieved, and finally scored according to the degree of similarity from high to low to give a candidate viewing list.

This is because fingerprints will be deformed due to factors such as pressure, and the deformation is often non-linear. In many cases, fingerprints will also shift and cover, and poor storage conditions are commonplace. Fingerprints found at crime scenes are more common. May be mutilated.

In short, automatic fingerprint recognition technology requires someone to do manual preprocessing on fingerprints.

For equipment such as employee punch cards, they only know how to compare whether two fingerprints are the same, and the recognition rate does not meet the police's needs at all.

At this time, Wu Jun only saw Jiang Yuan's expression, so he couldn't help coughing and coughing twice, and said: "It's nothing else, if you want to get off work, you can go back first, and I will do the rest."

"Uh... can it be?" Jiang Yuan hesitated.He kind of wants to try out the new technology, but it doesn't seem to be a hindrance to try again at home.

"That's all we have to do. We'll finish it when we're done." Wu Jun raised his chin proudly. Compared with the policemen who just started to get busy, the forensic doctor's work is over.

(End of this chapter)