Detective: I have a split personality, but I’m not a murderer

Forensic Division, Laboratory!

As the sound of Xiong Lei Lei at the door sounded, everyone turned their heads and looked at Gao Ting.

Gao Ting suddenly had a feeling like a man’s body, as if everyone’s eyes were thorny.

Director Sun Changming stepped forward with a smile:

“High Court?

Sure enough, it’s a talent, not bad! ”

He had something yesterday and did not see the high court, and at this moment he looked the high court up and down, and his eyes were full of appreciation:

“I am Sun Changming, director of the Chaoyang Investigation Bureau.

If you want to identify physical evidence, you need to pass the technical test first, Xiong Leilei must have told you!?

More, I won’t be verbose.

If you don’t have a problem, just start the test! ”

After Gao Ting nodded, Sun Changming looked at the technician behind him who “sharpened the knife Huo Huo”:

“Let’s start asking questions!”

As soon as the words fell, a technician immediately stood up:

“Then I’ll come first!

Don’t you want to conduct physical evidence identification, then the first question is to ask you, what is the most basic principle of physical evidence identification? ”

“It’s the law of material exchange!”

Gao Ting said with a smile

This law was proposed by French professor Locar during a time when helping the Bureau of Investigation solve a case.

The law states that any criminal will exchange material with the victim or the crime scene.

Investigators can narrow the scope of investigation by finding and identifying these substances, determining the occupation, gender, job, etc. of the murderer, and finally lock the murderer! ”

The question seems simple, but its practicality is somewhat “sinister”.

The High Court claimed to personally identify the physical evidence, but if such a basic question could not be answered, then it was not directly disgraced?

At that time, don’t talk about identifying physical evidence, he is still embarrassed to stand in this room, he is thick-skinned enough!

“Not bad, but this question can be answered by many ordinary people.”

Another technician said:

“I’ll ask a specific question this time.

If the powder samples collected between the fingernails of the suspect were detected, rice starch, bismuth, zinc oxide, magnesium stearate and iron oxide were detected.

What do you think these powders are? ”

“It’s women’s cosmetics!”

High Court said quickly:

“The iron oxide in the sample is red, previously known as Venetian red.

Venetian red has long been used to make women’s cosmetics.

Leftover rice starch and so on are also substances that often appear in cosmetics.

Given that the powder was found in the suspect’s nails, if the same substance ratio was found in the victim’s cosmetics.

It should be possible to determine the suspect’s suspicion! ”

“What clues can hair provide when used as physical evidence?”

Another technician stepped forward.

Without thinking, Gao Ting spoke directly:

“If it’s hair with hair follicles, DNA identification can be done naturally!

In addition, the structure of hair under the microscope is actually large and complex.

From the root morphology, it can be judged whether the hair is naturally shed or pulled out by external force.

From the hair scales, it can be determined that the hair comes from humans or animals such as cats and dogs.

From the color and shape, the family genetic information of the hair owner can be obtained.

According to the residue of substances on the surface of the hair, it is also possible to identify the living environment of the owner, and the shampoo and conditioner used.

Even the frequency of shampooing, the time of the last shampoo, etc.

Through this information, the economic situation, living habits, working environment and so on of the hair owner can be further inferred. ”

“What is the most common method of finding physical evidence such as fibers and hair?”

“Tape hair!

Adhesive tape can stick to fine substances such as hair, fibers, paint and glass slag.

And the tape is transparent, even if the sticky substance is too small to be detected by the naked eye, it can be irradiated with a strong light source to make it appear. ”

Hearing Gao Ting’s answer to the four questions, the anger and dissatisfaction on the faces of the technicians slowly turned into surprise.

Some of these four questions are more basic, and some are more professional.

And the High Court all answered very correctly!

“This High Court, it seems that it does have some understanding of physical evidence identification!”

“Just know Lokar’s law of matter exchange and the tape method.

Unexpectedly, he could easily answer the composition of cosmetics and hair characteristics. ”

“It seems that he is not specialized in investigation, even evidence collection and identification, and he has also learned!”

……

The technical team leader He Fudao spoke loudly:

“These questions seem too simple for the High Court, but in fact, they are all minutiae, and laymen can know it by reading a few books.

You guys ask something professional, otherwise, let people think that our technical brigade is really a bunch of ‘rice buckets’! ”

Well, rice bucket!

Gao Ting clearly remembered that Xiong Leilei said this word when he told him about Zhou Yiting’s cursing process!

When He Fudao said this, he particularly emphasized the word, and sneered slightly, glancing at Zhou Yiting next to him.

Apparently, he remembers being scolded before and remembers very well!

“Since the captain has spoken, then I’ll ask a professional!”

A technician said:

“What equipment is needed to inspect the details of a fiber?

What are the advantages of such a device? ”

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