crime scene

"Hey!"

The traffic policeman in the middle of the road yelled.

That's speeding and running a red light.

Xie Qian also felt that this would cause trouble for the traffic police, so he picked up the walkie-talkie placed in front of the car and switched to a channel.

"This is Liu Zhelun, the traffic policeman. Someone ran a red light at the intersection. Please stop him at the next intersection."

"Hey, you're new here. I don't even know the car. I'm Xie Qian, the captain of the City Bureau's Criminal Police Team [-]. I'm rushing to handle the case."

"...Captain, turn on the police lights when you are in charge of the case, and then please pay attention to the discipline of the radio station."

Xie Qian was prescient, almost everyone in the traffic police brigade knew this jeep, and the only ones who could tell him to stop were probably newcomers.

It also made a new little traffic policeman criticize the discipline of the radio station.

It's still the same way, enter the school gate, show the ID to the guard, go directly to the second floor of the laboratory building, and enter the scene after dressing up.

"They are all chemical reagents, handle them with care and be careful," Chu Duanyu reminded.

There were no suspicious signs on the bench.

Only the victim's fingerprints were found on the desk, and there were only some work records and laboratory reports in the drawer.

Xie Qian looked at him, stretched out his hand and opened the cabinet containing the reagents, Chu Duanyu also went up to look at it, "It's neatly placed, there are not too many, close it."

"Wait." Su Nian said, "The brown one, it's placed in the wrong place. Although this room is not on the sunny side, there is a certain amount of time every morning to receive the sunlight. The reagents in the other brown bottles are placed in the In the back, only that one was placed in the front row."

Chu Duanyu nodded, as if it was like this, "Potassium permanganate solution is stored in a cool place. There is something wrong with putting it here. Gao Zhuonan is a chemistry teacher, so he shouldn't make such a mistake."

Xie Qian reached out to take off the glass bottle and opened it, the solution inside had been replaced.

Chu Duanyu opened the investigation box to collect evidence, while Xie Qian called Jiang Panpan, who had gone out to work, and asked her to return to the team for identification.

"Go, go back first"

Jiang Panpan and Xie Qian returned to the police station almost at the same time. Don't think that Xie Qian treats women well. In fact, he doesn't have any sympathy for women.

People of the older generation often say that people are divided into three categories, the first category is good at reading, the second category is good at teaching, and the third category is not able to beat and scold.

Jiang Panpan belonged to the second type of people, who changed everything as soon as he said it. He was much better than Chu Duanyu.

"Captain, I found out that Photon found a suspicious man downstairs in Chang Anyuan's company. The man ran away when he saw us. He has been captured and is on his way back." Jiang Panpan came back and first reported this Situation, then took the samples brought back by Chu Duanyu, and hid in the identification room.

Xie Qian sighed.

"What happened to the captain?" Chu Duanyu asked.

"The wrong person must have been arrested. The murderer has committed many crimes without leaving any evidence. How can he be caught so easily?"

"Then... won't Photon be punished for catching the wrong person?"

"No, it's not clean to run away after seeing the police." Su Nian sat in front of the whiteboard, still thinking about the whole case.

"Have you found out?" Xie Qian lifted his buttocks and sat on the desk behind him.

"I don't think the third case is the third case."

"What do you mean?" Chu Duanyu asked

"The needle tube found at the scene of the first case was the weapon used to kill the deceased in the second case, but at the scene, nothing that killed the deceased in the third case was found."

"Maybe the needle we found was just a coincidence." Chu Duanyu objected.

"Then how do you explain the replaced solution?" Xie Qian asked back.

Chu Duanyu thought for a while and replied, "It's also possible that the victim knew that the potassium permanganate solution was used up and just put something else... Forget my nonsense, it's not logical."

Xi Qian rarely said anything about him, but just gave him a look.

"The murderer's murder did not escalate, but lowered it to a lower level, so I was wondering if it was possible that for some reason, the original third deceased suddenly did not have the objective conditions to be killed, so the murderer temporarily asked someone to do it. Substitute." Su Nian put down the whiteboard marker and leaned on the desk to analyze.

"It may also be a copycat killing. At first there was only one suspect. Later, his modus operandi was discovered by the second suspect, who imitated him and killed Sun Dashu." Chu Duanyu analyzed seriously again.

"It's up to you!" Xie Qian picked up the file folder on the table and hit Chu Duanyu's head several times in a row, but the strength was not great, "Don't you know about Sun Dashu's visit and investigation? One has no money and the other has no hatred, why kill him, is it because he cheated and had an affair!"

Chu Duanyu hurriedly covered his head and dodged, "Then check the surveillance cameras that left Gaocheng at night and there may be clues."

It was raining heavily that night, and the vehicles were basically trucks traveling to and from various places. The license plate number could not be seen clearly due to the angle and weather.

"Captain, the test result is back, it's C4H10N2O." Jiang Panpan trotted to report.

"Barbiturates, over-the-counter drugs, are only available in large hospitals. They used to be central nervous sedatives, but they are rarely used because of side effects." Chu Duanyu talked about the uses of these drugs, and then looked at Xi Qian after a pause. "Also an intravenous euthanasia agent."

Xie Qian picked up the walkie-talkie reflexively, this clue came too timely.

"Zhang Yitian, investigate all the records of the sale of barbiturates in all hospitals, and checks from one hospital to another. The suspect is likely to purchase through abnormal channels. Let me compare the quantity of the medicine clearly!"

"The fourth knife is... blood amber." Su Nian said loudly.

The sky had already darkened, and the visiting criminal police had just returned and were sent out to help Zhang Yitian and Feng Li's team investigate, and some of them stayed in the office to wait for orders.

The one that Sun Yaoguang brought back was bought by a car thief.

Is there any objective reason to hinder the murderer's action?

It should be that the victim was out of the murderer's sight, and the strange place was beyond the murderer's psychological safety zone, so he couldn't do anything. That's why the third case was arranged.

It is also possible that the victim died suddenly and could not complete the original plan.

If the planned victim dies, the murderer probably wouldn't go out of his way to find someone to replace him.

Su Nian bit the corner of her lips, "The next victim has left Shishi suddenly in the past week. This kind of temporary business trip usually doesn't take too long. He should come back in the next few days. The train station, the airport, he It should be a person with at most a secretary, about the same age as the other victims, because he was short on time, did not bring any luggage, had a lot of work and entertainment, and was a frequent visitor to social places such as nightclubs."