"No, Tian Qing said that when he got the medicine, there were only four phenobarbitals left in the bottle, and the 120 mg dose was a little heavy at most, which did not match the high concentration dose of his blood test." Zhu Jiangjiang shook his head.

Moreover, the concentration of phenobarbital in Dong Wei's juice is about 800 milligrams, which means that more than one person may have been poisoned.

"When I screened the surveillance in the room, I found that at least four people had touched Dong Wei's cup on the day of the incident." Lan Bo tapped on the computer, unfolding four frames.

These four people are the waiter, Dong Wei's girlfriend Xiaoman, Dong Wei's brother Sledgehammer and Tian Qing, who has already been confessed.

Among them, the waiter and Xiao Man are all touching away, but Sledgehammer directly exchanged his juice with Dong Wei!

"Send the juice from the sledgehammer to the lab and see if there's phenobarbital in it?" Shi Chong said in a deep voice.

"Tut-tut, this Dong Wei usually looks really bad, so many people want him to die, won't even his brother do it?" Lin Zihan nibbled on the hamburger and shook his head again and again.

"Potassium cyanide is a regulated chemical that is generally only available in laboratories, hospitals or factories. Sledgehammer is a photographer, Dong Wei's girlfriend is a teacher in college, and she has more access to potassium cyanide. Queen Bee asked.

"Yes." Shi Chong's finger tapped on the photo of the sledgehammer, and the sledgehammer's initiative to change the drink was really suspicious.

The interrogation of the sledgehammer was not smooth, as if he knew that Shi Chong had not found any evidence, he behaved very calmly.

As for the act of changing the juice, he only explained that he didn't like the orange flavor.

"Dong Wei drank half of that glass of juice, and it was obvious that he didn't know anything about phenobarbital." Shi Chong looked at the laboratory report that had just been delivered, and motioned for Uncle Da to take this as a breakthrough point.

The cup that the sledgehammer replaced really contained phenobarbital, and the content was in line with the concentration Tian Qing said.

"After taking tranquilizers, the whole person will relax and drowsy, and it is difficult to feel negative emotions such as anxiety." Zhu Jiangjiang looked at the sledgehammer that had been yawning and said.

"If he can't be caught, the interrogation will not be fruitful." Shi Chong did not enter the interrogation room again, but handed over the interrogation task to Uncle Da and Lin Zihan, and chose to stay outside the interrogation room to observe.

Without sufficient evidence, it is not possible to detain these suspects all the time.

But once the suspect returns, there is enough time to destroy evidence and fabricate lies, and the difficulty of solving the case will only be higher, so this case can now be said to be a race against time.

"Captain, I investigated the laboratory of Baiyun University, and the experimental consumables record sheet is complete, and the potassium cyanide is well preserved." The queen bee called.

In order not to make a trip in vain, after the investigation in the laboratory was fruitless, Queen Bee asked Xiao Man's colleagues and learned that Xiao Man usually lives a simple life, and the only special thing is that he will receive flowers and gifts from mysterious suitors from time to time.

At first, they all thought it was sent by Tong Wei, but later found out that Xiaoman never brought flowers home, and then they realized that it was an unknown person. I asked, and all I had sent before were sunflowers. And the day before the incident, that is, yesterday, Xiao Man received a handful of lavender. Queen Bee said.

"The flower language of sunflower is silent love, while the flower language of lavender is salvation." Zhu Jiangjiang looked at the information searched out on his mobile phone and tightened his brows.

"Actually, it's not just labs that can get potassium cyanide." Shi Chong stared at the people in the interrogation room.

At this time, Sledgehammer was obviously taken aback after learning that Dong Wei had died of phenobarbital poisoning.

Although he quickly covered up the past with a yawning action, he was still keenly spotted by Shi Chong.

"Let him go back and tell him that his suspicion is clear and he can go." Shi Chong connected Uncle Da's headphones and said.

"Can you go?" The expression on Sledgehammer's face was a mixture of astonishment and confusion, but he didn't see any relief.

"Yes, the murderer has been found, you can go." Lin Zihan packed up the documents scattered on the table and looked like a send-off.

"The murderer has been wrong for a long time, and you are embarrassed to be a policeman. I thought it was potassium cyanide in the laboratory, but I didn't know that there was also a contrast agent? ”

The sledgehammer dodged Lin Zihan's hand, sat back on the stool, and rubbed his messy hair.

Without waiting for Lin Zihan and others to speak, Sledgehammer confessed his crime.

As a photographer, he can easily get potassium cyanide, and he has been prepared for a long time, and he put potassium cyanide into his cup, and then replaced it with Dong Wei, which is replaced by the poisoning step.

At the same time, because he knew that potassium cyanide poisoning was painful, he couldn't bear it, so he stole Dong Wei's medicine and gave it to him in advance, so as to ensure that no one would find out when the crime occurred.

Unexpectedly, because he couldn't grasp the amount well, he put too much phenobarbital, so that Tong Wei did not die of potassium cyanide, but died of phenobarbital overdose.

As Tong Wei's brother, he easily came into contact with Tong Wei's drugs and poisoned them in advance; As a photographer, potassium cyanide is enough to leave a portion of it behind when it is developed.

At this point, all explanations seem plausible.

"What about motivation? Why? Uncle Da asked in a deep voice.

"Motivation? Seeing that he is not pleasing to the eye, what other motive does he need to kill someone? I have pleaded guilty, and I have made it clear how I committed the crime. The plastic bag containing potassium cyanide was flushed into the men's toilet by me, and I can't help it if you can't get it. ”

The sledgehammer crossed Erlang's legs, yawning repeatedly, and tears overflowed from the corners of his eyes.

"Ask him if he gave him the sunflowers and lavender." Shi Chong said.

Sure enough, although Sledgehammer hesitated for a long time, he finally admitted that he was the mysterious person who silently sent flowers to Xiao Man.

"He was too cruel to Xiaoman, I persuaded him many times, let it go if he didn't love it, but he was a madman." Sledgehammer had a dull expression, as if remembering a person who was not worth mentioning.

"The day before yesterday, he told me that he found out that Xiaoman had cuckolded him, and he said that he wanted to give her a good look. Sooner or later, he'll kill her, and I can't help it. ”

"The murderer is not him." Shi Chong clenched his fists.

"The lethal time of central nervous system drugs such as phenobarbital is not only related to concentration, but also related to human physique. Dong Wei has a long-term history of drug dependence, which makes it difficult to judge the time of his poisoning after taking a large dose of the drug. Zhu Jiangjiang sighed helplessly.

Considering the time and difficulty of poisoning, the most suspicious object is Tong Wei's girlfriend.

But Sledgehammer's confession is justified. As long as Xiao Man doesn't admit it, there is no way to take her.

After knowing what Sledgehammer did to her, would she be willing to take the initiative to confess?