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

“To identify the details of the fibers, I use a polarizing microscope!”

In the assurance laboratory, the high court quickly answered:

“The special filter of the polarizing microscope transmits light to the inside of the fiber, thereby illuminating the internal structure of the fiber.

Based on this, the size and type of fiber can be judged.

There are also fuels used, processing techniques and so on.

Further, it can be determined that the fiber comes from clothing, cloth bags, or foot mats, etc. ”

“So if there are two fibers, how can you tell if they come from the same item?”

“This is also easy!”

Gao Ting: “You can use a light bridge to connect two microscopes.

This makes it possible to observe key characteristics such as shape, color, texture and material of both samples simultaneously.

So as to judge whether the two are the same origin! ”

“What about the smaller size of the substance that needs to be identified?”

The technical captain of Miyun District felt that the problem of ordinary technicians was too simple, and personally spoke:

“Like, now there’s a rope!

Through the microscope, I found particles as large as the tip of a needle on the rope fiber, how do you further identify these particles? ”

Gao Ting didn’t think about it, and said directly

“I would choose a scanning electron microscope!”

Dongcheng District Technical Captain: “What is the reason for this choice?” ”

“Because scanning electron microscopes use focused electron beams instead of ordinary beams, the scanned images will be clearer!”

Gao Ting said: “Moreover, the scanning electron microscope has higher resolution and excellent depth of field.

It also provides a clear 3D image of the sample.

Based on this information, the type of particles can basically be determined. ”

Captain Huairou: “How to identify very small amounts of dangerous goods?” ”

“Using a single-particle aerosol mass spectrometer, the method is…”

Shunyi technical captain: “How to detect processed shoe prints and tire prints at crime scenes?” ”

“Using a 3D laser scanner…”

The technical captain of Haidian brought up a photo from his mobile phone:

“There was a burglary in our Haidian District not long ago, and at the crime scene, we found the wire that was dropped by the suspected robber.

On the wire, some tiny brown spots were identified.

This photo was taken after enlarging the spots!

Can you recognize what they are? ”

Gao Ting only glanced at the photo and said

“It’s spores, fungal spores!

The shape, markings and color of the spots are typical of fungal spores. ”

……

The technical captains of each district asked questions separately, and the High Court also answered them like a stream.

The expression on the face of the ordinary investigator behind also changed from surprise to surprise, and finally to shock.

At first, the questions posed by ordinary investigators were good to say.

Like how to identify the details of the fiber, how to compare two fibers, how to identify the residue of fine substances on the fiber, etc., they can basically answer.

However, the difficulty of the problem of the technical captains of each district has obviously increased a notch, and it is basically difficult to use the usual identification.

Let them answer, I’m afraid they will have to think about it for a while!

Especially the photo of the captain of Haidian District, everyone did not recognize it.

Because the problem itself is a bit of a hooligan!

After identifying the structure of a subtle substance, if it is not possible to determine its species, it is usually compared in the material catalog.

Identify the big categories first, then confirm the small categories!

How can you take out a photo and let others identify it directly?

The point is that the high court actually answered!

Looking at the not very good-looking face of the captain of Haidian District, and the fact that he did not deny it afterwards, Gao Ting obviously answered correctly.

That’s a bit outrageous!

“This high court, it seems that there is really something!”

“It seems to be much stronger than me!”

“There are many questions, I’m afraid I will answer them wrong!”

……

Zhou Yiting next to Gao Ting, her expression was mixed with surprise mixed with surprise.

Although she believed in the High Court very much, she was still very surprised to hear that he answered those messy questions like a stream.

“This time to entrust the High Court to investigate, it is definitely the right one!”

Xiong Leilei listened to Gao Ting’s answer and couldn’t help but widen his eyes.

He has average grades, so he admires those who study well the most.

Before Gao Ting came, he admired Lin Xiaoxiao.

But after the High Court appeared, the object of his admiration was replaced by the High Court.

However, he previously thought that the High Court was only a powerful investigation, but he did not expect that he was so proficient in the more complex field of physical evidence identification.

“Good, good, good…”

Sun Changming kept cheering in his heart, and his eyes were extremely bright when he looked at Gao Ting.

This high court is really a talent!

What a treasure this time!

Soon, almost all the technical captains on the scene asked questions.

And the high court also completed the accurate answer.

The only one who did not ask questions was He Fudao, the technical captain of the Chaoyang Investigation Bureau.

Seeing that the High Court easily answered all the questions, he also knew that he had underestimated the High Court before.

This high court is not a novice in the identification of physical evidence at all.

Nor has he ever undergone any study in physical evidence identification, as described in the data.

He is well versed in the characteristics, identification instruments, and identification methods of various physical evidence, and it is absolutely impossible to achieve this level without years of study and research.

He Fudao thought about it and stood up:

“High Court, I have one last question!

The sample is still fiber that someone asked about before.

The characteristics of the sample, or the presence of fine residues of substance.

You said earlier that you can use a scanning electron microscope to determine the type of substance.

However, because there are so few substances left, after scanning, it is still impossible to determine what kind of substance it is.

However, when the case is solved, it is urgent to determine the type of substance.

In this case, what are you going to do? ”

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