Forensic doctor: I only love dissecting corpses and idolizing Hannibal

Chapter 40 It’s not too late to explain now (please collect it, fifth update)

Ye Qingmei stood up and said: “The director is not what you think.”

Chen Fan said: “The director is what you think. .”

Ye Qingmei was speechless and rolled her eyes at Chen Fan. Sure enough, enchanting people are enchanting even if they blink.

The director was very helpless and asked, “What are you busy with?”

Chen Fan said, “We calculated the circumstances under which the deceased was shot. Currently, I think the one who was kneeling on the ground and tied up was probably the highest, otherwise there is no other explanation.”

The director said: “Well, okay, by the way, Chen Fan, you have finished writing your thesis. Go to the medical school to report it. Ye Qingmei, prepare to take people to arrest him.”。”

“OK ”

The director personally asked someone to drive Chen Fan to the city.

Chen Fan took the wheel and came to an office, knocked on the door, looked at the person inside the door, then turned around and planned to leave.

You must have come in the wrong place.

A few old guys saw Chen Fan and grabbed him without saying a word. They couldn’t let the boy run away.。

“You’ve come, why are you leaving?。”

“I’m a little nervous. ”

A few people looked at each other with smiles.

Chen Fan felt that there must be nothing good going on.

He gave the document to the other party, Liu Xi picked it up and said, “Is it an accident? I’m still an honorary professor here。”

{“Not surprisingly, after reading it, I went back. ”

Liu Xi took out his glasses, put them on and started browsing bit by bit.。

“The basic type of fingerprint is the noun of handprint science. According to the different structures of the internal patterns of fingerprints, fingerprints can be divided into four types: arcuate pattern, skip-shaped pattern, bucket-shaped pattern and mixed pattern: (1) bow-shaped pattern; (2) skip-shaped pattern, with more than one bar in the center of the internal pattern. The upper part and both sides of the skip line are surrounded by more arcuate lines, and the lower part is made of some wavy lines and horizontal straight lines as the base line. (3) Bucket-shaped pattern. There is more than one circular line, or spiral line, or curved line in the center of the internal system. Its upper part and both sides are surrounded by more arcuate lines, and the lower part is surrounded by some wavy lines and horizontal lines. It is a combination of three systems. (4) Mixed patterns, any pattern that cannot include the above three single patterns, but is composed of a mixture of two patterns, or some patterns with strange shapes and complex structures that cannot be classified into bow, skip, and bucket patterns, are collectively called For mixed patterns. ”

The things written in front are normal, but when I read down, about the extraction of fingerprints, I was a little confused. There are a lot of

ways this guy wrote.

Liu Xi pushed up his glasses and looked at them carefully. This isn’t right, right?。

“Have you verified the methods you wrote here?

Chen Fan said: “Yes, there are too many traditional fingerprint samples, and we can’t expect the police to collect fingerprints. ” ”

The guys looked at each other. This is true. For many police officers, they basically have zero experience in on-site investigation. Those who have

some experience can only throw a cigarette butt into a plastic bag and let the forensic doctor do the operation.

Most of the domestic police systems are learned from Hong Kong or Singapore.

However, police officers rarely receive professional training in on-site investigation. Even if they are trained, police officers rarely use them in reality. There

are many methods given by Chen Fan. They are basically the most commonly used and the most convenient method to find.

Iodine fumigation

[ Read more novels by visiting our website: Knight Novels ] method – that is, using iodine crystals to heat to generate steam, which reacts with the grease in fingerprint residues. Afterwards, yellowish-brown fingerprints will appear, which must be photographed immediately or fixed with chemical methods; Ninhydrin method – spray the reagent on the specimen and react with the amino acids in body secretions to produce a purple color. fingerprint; silver nitrate method – after the silver nitrate solution reacts with the sodium chloride in latent fingerprints, black fingerprints will be produced under sunlight; fluorescent reagent method – fluorescein and o-phthalaldehyde almost immediately react with fingerprints The remaining proteins or amino acids act to produce highly fluorescent fingerprints. This reagent can be used on the surface of colored objects.

Liu Xi thought about it and said, “I won’t tell you what to do next. Which of these methods do you personally think is best?” ?”

“Silver nitrate is the most convenient and easiest to collect. We now have machines that can find fingerprints using fluorescence methods, but it is very difficult to bring complete fingerprints to the laboratory. ”

This is the truth.

In the early years, when there was no other way, fingerprints were collected with tape.

Even like this, the older generation of forensic scientists can see something, but remember, this is just one point.

Moreover, now the intranet Many of the fingerprint databases are in tatters.

Chen Fan said silently: “I don’t want my workload to increase because of other people’s stupidity. ”

These words are ruthless and arrogant, but they are the truth.

You can think of it this way, the teacher said, a question can be completed by two people, the bad student and the top student. The

bad student writes the first question, and the top student writes the second question. Two questions.

However, it took the poor student five hours to write the first question, and the top student only needed three minutes to complete the second question.

This time can actually be omitted.

Liu Xi continued to read, the more he read, The more cold sweat broke out on his back, and the more he looked, the more he felt that over the years, he had learned all his skills like a fool.

Damn it, am he a waste?

Liu Xi only saw half of it and raised his head. Looked at Chen Fan.

At this time, Chen Fan was touching the cigarette on the table.

Damn, Shili Police Station must be full of thieves.

You guys also pay attention to inheritance, right?

“Here it is, give it all to you. I have another one here, give it all to you.。”

“Thank you, leader. ”

Liu Xi said: “Chen Fan, have you ever thought about it, if all of your experiments are successful, you will truly have established a discipline. Chen

Fan was stunned for a moment and said: “Ah, that’s it. In fact, there is no need to study fingerprints systematically. It can be treated as an elective course. After studying it, we forensic doctors will have no jobs.” Liu Xi said: ”

Then why not learn them all?” I would rather the forensic doctors not have a job, and I also hope that the police would not have a job and they would all lie down and sleep at home. ”

This is the truth. If the police and forensic doctors are idle, doesn’t that mean there is peace in the world?

“You will have a public class soon, go to the police academy and give those boys a good lesson. ”

Chen Fan became nervous and said, “It’s very tiring. They don’t understand after I said it.”。”

“I just eliminated a fingerprint detection machine here…I heard you are short of parts。”

“Don’t worry, I will definitely teach you clearly about those people. ”

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