Chapter 40-It's Not Too Late to Explain
Ye Qingmei stood up and said,"Director, it's not what you think."”
"Director, it's exactly what you think," said Chen Fan.”
Ye Qingmei was speechless and rolled her eyes at Chen Fan. Sure enough, a seductive person could be seductive even if she blinked her eyes.
"What are you guys busy with?" the director asked helplessly.”
Chen Fan said," I've measured the situation of the victims. At present, I think the highest possibility is that they were tied up while kneeling on the ground. Otherwise, there is no other explanation."”
The director said," En, okay. By the way, Chen Fan, you have finished writing your thesis. Go to the medical school and report. Ye Qingmei, get ready to arrest her."”
"Alright."
The director personally asked someone to drive Chen Fan to the city.
Chen Fan came to an office with the rune and knocked on the door. He looked at the person inside and turned to leave.
He must have come to the wrong place.
When the old men saw Chen Fan, they immediately caught him. They couldn't let him escape.
"You're already here. Why are you leaving?"
"I'm a little nervous."
The few of them looked at each other and laughed.
Chen Fan felt that it was not a good thing.
Liu Xi took the document and said,""Surprised? I'm also an honorary professor here."
" No, I'm not surprised. I'll go back after I finish reading it.”
Liu Xi took out his glasses, put them on, and started browsing.
"The basic type of fingerprints is the term for handprints. According to the different structures of the internal patterns of the fingerprint, the fingerprint could be divided into four types: (1) bow-shaped pattern;(2) dustpan-shaped pattern. There is more than one dustpan-shaped line in the center of the inner pattern. The upper part and the periphery of the two sides are surrounded by more bow-shaped lines, and the lower part is made of some wavy lines and horizontal straight lines as the foundation line. (3)The Dou-shaped pattern had more than one circular line in the center of the internal system, or a spiral-shaped line, or a curved line. The upper part and the periphery of the two sides were surrounded by many bow-shaped lines, and the lower part was formed by a combination of three systems, namely a wavy line and a horizontal line. (4) Mixed red patterns, where the above three single patterns cannot be included, but the patterns composed of two kinds of red patterns, or some patterns with strange shapes and complicated structures that cannot be classified as bow, dustpan, and bucket patterns, are collectively called mixed patterns.”
The first part of the article was still considered normal, but when he read down to the part about fingerprint extraction, he was a little confused.
This kid had a lot of ways to write.
Liu Xi adjusted his glasses and looked at it seriously. This was not right.
"The method you wrote here, did you verify it yourself?”
" Yes," Chen Fan said." There are too many samples for traditional fingerprints. Moreover, we can't expect the police officers to follow us and collect fingerprints."”
Everyone looked at each other. This was the truth. For many police officers, crime scene investigation was basically zero experience.
Those who had some experience would at most throw a cigarette butt into a plastic bag and let the forensic doctor handle it.
Most of the domestic police system was learned from Hong Kong or Singapore.
However, police officers rarely went for professional training in crime scene investigation. Even if they did, police officers rarely used them in real life.
Chen Fan had given him many methods, but they were all the most commonly used and most convenient methods.
Iodine Fumigation Method-It uses an iodine-based crystal to generate steam. After it reacts with the grease of the fingerprint residue, a yellow-brown fingerprint will appear. It must be immediately photographed or fixed by chemical methods. The Ninhydrin method sprayed the reagent on the specimen. After reacting with the secreted protein, a purple fingerprint would appear. Silver Nitrate Method: After the silver nitrates react with the salt in the latent fingerprints, black fingerprints will be produced under sunlight. The fluorescent reagent method--Lucifer's amine and o-Phthalylal react almost immediately with the protein or amine acid of the fingerprint residue to produce a highly fluorescent fingerprint. This reagent can be used on the surface of colored objects.
Liu Xi pondered for a moment and said,"I won't say anything else. Which of these methods do you personally think is the best?"”
"Silver nitrates are the most convenient and easiest to collect. We have machines that can find fingerprints and fluorescent methods now, but how to bring the fingerprints to the laboratory in one piece is very difficult.”
This was the truth.
In the early years, when they had no choice, fingerprints were collected with tape.
Even if this was the case, the older generation of forensic doctors would be able to see a little, but remember, this was only a little.
Moreover, many of the fingerprints in the intranet database were in tatters.
" I don't want to increase my workload because of other people's stupidity," Chen Fan said quietly.”
These words were heartless and arrogant, but they were the truth.
It could be said that the teacher said that a question could be solved by a combination of a slacker and a top student.
The slacker wrote the first question, while the top student wrote the second question.
However, it took a slacker five hours to complete the first question, while a top student only needed three minutes to complete the second question.
This time could actually be omitted.
Liu Xi continued to read. The more he read, the more cold sweat broke out on his back. The more he read, the more he felt that he had learned all his skills over the years.
Damn, am I trash?
Liu Xi looked up at Chen Fan.
Chen Fan was touching the cigarette on the table.
F * ck. The Shili Police Station was filled with thieves.
This thing of yours also pays attention to inheritance, right?
"Here, I'll give you all of them. I have another one here, I'll give them all to you.”
"Thank you, Leader."
Liu Xi said," Chen Fan, have you ever thought about it? If all your experiments are successful, you will be considered to have really opened a subject."”
Chen Fan was stunned for a moment and said," Ah, then let's open it. In fact, there is no need to learn fingerprints systematically. It can be treated as an elective course. If we have already learned it, we forensic doctors have no job."”
"Then why don't you learn them all?" Liu Xi said. I'd rather the forensic doctor not have a job. I also hope that the police won't have a job and will all lie at home and sleep.”
This was the truth. If the police and forensic doctors were very free, wouldn't the world be peaceful?
"You'll have a public lecture later. Go to the police academy and teach those kids.”
" It's tiring," Chen Fan said." They won't understand."”
"I just eliminated a fingerprint detection machine…I heard that you're short of parts.”
"Don't worry, I'll definitely teach those people clearly.”
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