Police Detective

After Director Ma gave the order, several people inside quickly evacuated.

On the first and second floors, all windows and doors were opened, waiting for the site to evaporate naturally.

"Well, let's wait and go in." Director Ma looked at the warning tape and said, "Pull the warning tape out again to stop people from watching."

"Team Zhao, take Xiao Wang and back up all the video data in the area first; Team Li, take Xiao Bai upstairs to take a look and stabilize the homeowner upstairs." Director Ma started the scene command.

This is a row of commercial streets, with underground garages below, some ordinary residential buildings above, and shops on the first floor.

The thief's method of entry was to rent the apartment upstairs in advance, and then, this afternoon, he began to open the floor between the upstairs and the gold shop.

The building here is still relatively new, and the floor structure is made of reinforced concrete. It is theoretically very difficult to penetrate it, but with hydrofluoric acid in it, the reinforced concrete is not as good as plastic or wax.

Hydrofluoric acid is completely different from the hydrogen cyanide used in Sun's previous suicide case. Since it cannot be completely ionized in water, hydrofluoric acid does not belong to the strong acid series, but this does not mean that this thing is not vicious. In fact, apart from the fact that it does not act that fast, it can be said to be very acidic.

Because of this, this thing is also a controlled item and cannot be obtained by ordinary people. However, because it is a controlled item, once it appears, it is generally not a good use. However, as a police officer, after Bai Song mentioned hydrofluoric acid, everyone else was not unfamiliar with it. Because this acid has other uses in many cases.

Downstairs, Director Ma listened to Hao Zhenyu's report and gained a better understanding of the scene.

This method of theft is unheard of. The main reason is that the movement is too great. Does this thief really think he can escape? Such a theft leaves behind a sea of ​​on-site evidence.

A normal thief would just unlock the door, break into the door secretly, etc. How could he make such a big move despite the alarm and surveillance.

But everyone present, including the gold shop owner, was a little impressed by the thief's "hard-core operation". This kind of imagination is really rare.

After on-site investigation, it was found that the substance that melted through the floor board was indeed hydrofluoric acid, and the amount was not small. The thief first pried open the floor of the bedroom upstairs, then drew a circle on the cement floor, and then surrounded it with plastic boards. , and sealed the surrounding plastic plate with a substance of unknown composition, and then poured hydrofluoric acid.

Hydrofluoric acid has a strong corrosive ability to silica and concrete, but the speed is not fast. This is a continuous process and requires continuous cleaning.

Since this corrosion is not directed downwards, but diffuses, the deeper it goes, the bigger the hole becomes, and eventually it dissolves through.

This substance has very special properties, it is a weak acid.

You should have learned about weak acids in junior high school, that is, acids such as acetic acid that cannot be completely ionized in water. However, when the concentration exceeds 5 moles per liter, self-ionization will occur. At this time, hydrofluoric acid becomes a very acidic acid, and it is natural to corrode the steel in reinforced concrete.

This stuff is poisonous. High concentrations of hydrofluoric acid will naturally produce acidic fumes, which can cause devastating damage to the respiratory tract. The fatal dose is only one or two grams. Therefore, the effect of gas masks on this can only be said to be average. Even if the room is full of remnants, full-body protective clothing and oxygen ventilators should still be worn.

Bai Song is currently studying inorganic chemistry, which is a very basic knowledge point.

The situation upstairs is that I don't dare to enter the bedroom casually. Firstly, I am afraid of damaging the scene. Secondly, I am worried about the quality of the floor slab to prevent any accidents.

The homeowner was really crying. Who should I ask to compensate for this situation? How to repair this house? It can only be blocked for a while.

The second floor was cordoned off first, and the homeowner was taken to the police station to get the records.

Team Li and Bai Song went downstairs to Director Ma and gave a detailed report on the situation on the second floor.

There are no really good entry conditions now, and everyone has heard about the power of hydrofluoric acid. Director Ma will not let people in no matter what. He is a little scared. If Hao Zhenyu is not experienced, he must wear protective gear and a gas mask. There was even a big problem at this point.

Hydrofluoric acid's damage to the human body is a chronic process. It will actively react with calcium and magnesium ions, causing the organs that rely on these two ions to gradually fail. It usually takes a few hours for the problem to occur and the problem is discovered. It was already too late.

Director Ma confirmed again and again, but still felt uneasy, so he arranged for people from the police station to take four on-site investigators to the hospital. Both Wang Huadong and Sun Jie have a certain amount of exposed skin and need to use calcium gluconate gel for protection in time. This thing is really too dangerous.

The scene is right here. I would rather not investigate for the time being than let my men have health or safety risks.

The last time he did a face sketch, Director Ma was unwilling to find anyone outside the branch. This time he was no longer vague and directly called the relevant departments of the municipal bureau.

After all, he was already the deputy director. Ma Donglai's call went directly to the municipal bureau command center and he described the situation in detail. In addition to this, I have actually reported once via the radio. This time the call was mainly to ask for help.

When it comes to hazardous chemicals, the city is more powerful, and it is completely normal for such things to be reported.

While waiting, Director Ma held a meeting on site.

According to the items and evidence that have been extracted from the scene, the stolen jewelry is basically consistent with what the gold shop owner said. There are six or seven jewelry cabinets in the store, half of which are silver jewelry and half of which are gold jewelry. There are also a few diamond rings and platinum jewelry scattered in each cabinet.

The thief was very specific in his theft. He went straight to the cabinet where the bracelet was stored and left nothing else.

The quality of this cabinet was not as good as expected. The reinforced iron cabinet could not withstand a crowbar. The thief seemed to have been prepared and went straight to the point. He took away dozens of bracelets and scattered diamond rings under the cabinet. .

There is a safe in the store. Generally speaking, new goods or goods that are not on display, as well as gold bricks and gold ingots, are kept in large safes worth hundreds of thousands of yuan. The clerk in this store does not have safe keys, so things are placed in various cabinets every day.

The thief did not touch the safe, nor did he touch other cabinets. Currently, this cabinet is indeed the most valuable cabinet in the entire store. Because for other items, even if 100 rings are placed, it will only weigh about 400 grams.

I have to say that this was a successful act, and it should have taken a long time to plan compared to many stupid thieves.

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