The little catcher in the police station

"Ah."

Cheng Guowei turned his gaze and saw a cup of leftover coffee on the table, and a forensic doctor was extracting the remaining liquid in it, preparing to take it back for testing to see what kind of toxin it was.

But even without testing, Cheng Guowei would know that the deceased was poisoned by hydrocyanic acid.

Because the first two victims also died of hydrocyanic acid.

Cheng Guowei saw the wife of the deceased at the side. At this time, she was a little emotionally broken and kept choking.

So he walked over and comforted: "Please forgive me, I have a few questions I want to ask you, what's your name?"

"My name is Lu Fei, if you have any questions, just ask!"

Lu Xia wiped her tears, ready to answer the police's questions.

"When did you find the dead man?"

"I came back from my mother's house, and when I opened the door, I suddenly saw him lying on the ground. I thought he was drunk and fell asleep on the ground, so I called him, but he didn't respond at all. When I found out he was dead, I rushed to call the police."

"How is your relationship as a husband and wife?"

"It's fine. Except for his alcoholism, my husband is fine."

"Has your husband been in contact with any strange people recently, or had disputes with them?"

"I didn't pay attention either, he rarely let me know anything."

"Then do you know Xu Lili and Cai Le?"

"No, I don't know each other. What happened to them?"

"Oh it's all right!"

Cheng Guowei did not reveal too much about the previous two cases, but recorded a detailed statement for Lu Xia. As he expected, there were very few clues.

This is a serial murder case.

Two weeks ago,

The police received a report from the hospital saying that a female patient was sent to the hospital for emergency treatment, and finally declared dead after the doctor's rescue failed.

The doctor extracted a high concentration of hydrocyanic acid in his body, and suspected that the deceased died of hydrocyanic acid.

This is most likely a criminal case.

The police immediately started the homicide detection process.

The deceased, female, 29 years old, Xu Lili, a cashier at a supermarket.

As the deceased's husband, Wang Can, he is suspected of committing a major crime.

The reason why the police listed him as a key suspect was because he had bought 100 million personal accident insurance for the deceased three years ago, and this huge amount of insurance was still in effect until the deceased died.

Wang Can has a sufficient motive for killing: murder to cheat insurance.

In the victim's home, the police found the leftover drink left by the deceased. After the sample was brought back, the forensic doctor also extracted hydrocyanic acid from it. The deceased was poisoned after drinking it.

The police conducted a comprehensive investigation of the victim's home, and found no trace of a third person, and there were no signs of prying on the doors and windows, which also aggravated the police's suspicion of Wang Can.

Cheng Guowei organized an investigation team to visit and investigate his neighbors, relatives and friends, and how the relationship between the husband and wife is;

While summoning Wang Can to the detention center for questioning, he refused to admit that he had committed the crime, and said that both husband and wife had bought accident insurance for each other. This was just to give each other a guarantee, and there was no subjective motive for killing and fraudulent insurance.

Faced with this situation, Cheng Guowei also had doubts. Did the investigation go in the wrong direction?

If not him, then who?

For a while, all clues were cut off. As a last resort, the police could only focus on the husband of the deceased again, and kept summoning him to assist in the investigation.

The neighbors around also thought that the deceased was killed by her husband Wang Can. The words were terrifying, and the three became tigers. Amid such rumors, Wang Can kept running to the police station. The first thing was to find The real murderer defended his wife and cleared himself of suspicion.

The case fell into a deadlock for a time, and the police did not find sufficient evidence to prove that the deceased was killed by Wang Can.

Therefore, Cheng Guowei had no choice but to change direction. He personally led the team to start with the highly toxic hydrocyanic acid, and at the same time arranged another group of investigators to investigate Xu Lili's social relations.

Where did the killer get the highly toxic compound from?

Once it is found that Wang Can has purchased hydrocyanic acid, then the chain of evidence can be supplemented, and he has no excuse to deny it.

In the Liangbo police, nearly a thousand police officers were mobilized to search out large and small chemical companies in the city and ask about the outflow of such highly toxic substances.

However, the results of the investigation showed that there was no outflow or loss of hydrocyanic acid.

This is very strange. If no hydrocyanic acid flows out, how did the hydrocyanic acid eaten by the deceased come from?

The further down the case is investigated, the more mysteries become.

At this time, Cheng Guowei got an important clue. He learned from a chemistry professor in a university that hydrocyanic acid does not need to be bought, and anyone who knows a little about chemical synthesis can easily extract it. Raw materials can be bought anywhere.

And such a thing?

Cheng Guowei suddenly became interested, and he continued to learn more about:

Cyanide, more precisely cyanogenic glycosides, is commonly found in fruit pits, which can be hydrolyzed into hydrocyanic acid.

For example, use apple cores to extract hydrocyanic acid.

It sounds really scary, a small apple is actually very poisonous, who would dare to eat apples after this?

In fact, there is no need to worry. The content of cyanogenic glycosides in apple seeds is very small. Humans are relatively large in size. If you feed them to small animals such as hamsters, you need to pay attention to removing the seeds, but for humans, even eating one or two grains by mistake Apple seeds are also not poisonous.

Unless it is chewing a lot, of course normal people will not eat like that.

What if it's not normal?

This discovery made Cheng Guowei immediately change the direction of the investigation, and began to focus on visiting the surrounding fruit shops, asking whether Wang Can had come to buy a large amount of fruit.

At the same time, his education background and working environment were investigated, as well as whether there were related equipment used to extract poisons at home. Even the wall breaking machine in his home was brought back to the technical department to test the residue inside.

With the continuous investigation of the case, the police have not found a breakthrough.

The case has not been solved for a long time, and more than a week has passed in the blink of an eye. All the police forces of Liang Bo have put in a lot of effort, but there are very few clues.

Until three days ago, the case took a turn for the better.

No, I can't say it's a turning point, I can only say it's unfortunate!

The second deceased appeared. The deceased was still a woman named Cai Le, aged 2, and the cause of death was exactly the same as the previous victim.

The murderer's method of committing the crime was the same, and they didn't leave any valuable clues at the scene. Until now, Cheng Guowei didn't even know whether the murderer was a man or a woman.

He immediately conducted a joint investigation of the two cases, looking for similarities between the two to determine the nature of the case.

The families of Cai Le and Xu Lili have no intersection, and their husbands are also strangers to each other.

Chapter 283 Either Age or Various Disabilities

In the second case, Wang Can's suspicion was lowered, and Cai Le's husband had an alibi.

So what is the murderer's purpose?

What is his or her motive for committing the crime?

What do the victims have in common?

The murderer is a regular killing?

Or random killing?

Fruits that can be bought anywhere, highly poisonous that can be easily extracted, unknown poisoning methods, and unrelated victims.

Everything indicates that the murderer seemed to kill at random.

This is terrible!

When these two cases have not yet been detected, it is the first time in 3 days.

Today, there was another murder case, and the murderer is still killing people.

But this time the victim has become a male, which seems to confirm Cheng Guowei's words, the murderer is random.

jingle bell~

At this moment, Cheng Guowei's phone rang.

He didn't need to look, he knew that the leader had called again.

Unbelievably, three people have already died, and the characteristics of a serial murder case are already very obvious.

"Hi, Bureau Chang, I'm Cheng Guowei."

"Yes, I'm on-site inspection, and it's consistent with the previous two cases. I suggest joining the case for investigation."

"Here, isn't a week too short? I'm afraid..."

"Yes, I will do my best to complete the task."

After Cheng Guowei hung up the phone, he stood there in silence for a moment.

The leader just called to inquire about the case, and was furious when he heard that this was the third victim of the serial murder case.

Ask Cheng Guowei to arrest the murderer within a week at all costs.

Otherwise, if the label of unfavorable public security management in a jurisdiction is removed, the authorities will be punished from top to bottom.

There is no way, the frequency of the murderer's crimes is getting higher and higher, even if the case is solved within a week, the murderer is likely to commit another crime during the incident in between.

After a while, the technical investigation criminal police at the scene reported that there was no sign of intrusion into the victim's home.

The fingerprints collected at the scene still need to go back and compare, but based on past experience, it is impossible for the murderer to make such a low-level mistake.

"The intelligence department immediately organized a comprehensive investigation of the personal information of the three deceased. I want to find all their files from childhood to adulthood, including their birth certificates."

Cheng Guowei was really ruthless this time, and he was going to expand the scope. He still doesn't believe in this evil. Could it be that the murderer really committed the crime randomly?There is still some motive for the murder that no one knows.

"At the same time, arrange a group of investigators to visit the three victims again to see if there are any valuable clues about their personal and social relationships, whether they have any mutual friends, etc."

"Finally, check the fruit shops, stalls, etc. in the city. Even if hydrocyanic acid is extracted, a lot of fruit will be consumed. This line is also very important and cannot be ignored."

Now it is a race against death, every minute and every second cannot be wasted, because sometimes, this second may be a fresh life.

……

After Jiang Hao got the hard drive back from the store owner, he took Cui Yong's car and returned to the criminal investigation detachment. He called the video directly on his office computer and began to check it.

Watching videos is already Jiang Hao's housekeeping skill, 16 times speed, it seems that there is no pressure, Hou Fan is not surprised anyway, he already knew that Jiang Hao has this ability.

But Cui Yong behind him was a little unhappy.

I think Jiang Hao is too good at pretending. You are also a young man, why are you so good at pretending?Even if you drive at 8x speed, it’s fine, but at 16x speed, can you see it clearly? Look at the hammer!

Although he was unhappy at this moment, after all, he was arranged by Team Cheng to cooperate with them, and he couldn't say much about what they were doing, so he could only say to himself in his heart:

Let's see what tricks he can come up with in a while.

Through the store owner's recollection of the time when the girl came over that day and the time when the courier sent it out, Jiang Hao roughly estimated the playing time of the video, and first focused on the girl with the severed hand.

Through the quick search of 16 times surveillance, it only took about half an hour, and Jiang Hao found the girl they were looking for in the surveillance video.

"I found it, it should be this girl."

Jiang Hao adjusted the speed of the video back to the normal playback speed.

At this time, Cui Yong heard him say that he had found it, and some skeptics came over. He didn't believe that there was really someone who could watch the surveillance 16 times, so that he could really find him?

A young woman in loose plain clothes came in from the outside and appeared on the surveillance screen. There was no palm on her left arm, and she held a courier in her only right hand.

"Look, is the courier she brought over the same courier that was sent to Wei Qiang?"

Hearing this, Hou Fan quickly took out his mobile phone, took out the photos taken by Miao Xiaofeng, and compared them carefully.

"It's really her!"

The results of the comparison are highly similar, and the shape and size of the express delivery are almost exactly the same.

Faced with this result, Hou Fan was very happy.

"Amazing, you can see it all!"

Cui Yong never expected that he was really found out, and he felt a little embarrassed for his arbitrariness just now.

"What's the matter? You don't know how powerful our Xiao Jiang is. Don't look at him because he is young, but he is underestimated. Although he is not from a major in our class, he is even better than a major in our class. The province has two special indicators every year." One of the recruitment quotas was given to him, and the other one is still vacant. During the internship, he participated in a transnational joint investigation team, cracked a huge case of transnational trafficking in women, and even killed countless drug dealers. After returning to China, he even got a first class. Gong, you just say it’s bullshit or not!”

When Hou Fan talked about these deeds, it seemed that he was talking about himself, and he was very proud.

And Cui Yong was dumbfounded at this time. He is also a young man, and I am still running errands to pour tea. He has already reached the pinnacle of his life.