three murderers

It turned out that the moment Kong Yang heard the name of Bu Sifei's project at the defense site, his mind flashed like a flash, and he remembered a case he encountered more than ten years ago, which was about food poisoning caused by eating puffer fish. He quickly recalled the case Looking back at the situation at the scene, recalling the facial features of the deceased Qin Chu, it was exactly the same as at that time!So Kong Yang couldn't help making another speculation in his mind—the deceased was not strangled to death, but died of poisoning.

Puffer fish, with delicious meat and rich nutrition, is a high-end and precious aquatic product, known as "the crown of dishes"!But the more beautiful things may be, the more dangerous they are. This is a general rule in nature, and puffer fish are no exception.The tetrodotoxin contained in the delicious meat-wrapped viscera of wild puffer fish is a deadly poison!Symptoms of poisoning are often nausea, vomiting, abdominal pain and diarrhea. Severe cases can lead to weakness of limbs, unsteady walking, complete paralysis of the respiratory center, respiratory failure, and even death.

In other words, the symptoms of tetrodotoxin poisoning are very similar to suffocation death.

So at the first moment, he quickly contacted his colleagues in the laboratory department and asked for further histopathological examination and toxicological analysis on the deceased, hoping to confirm his speculation.

After waiting patiently all morning, he finally got the result he wanted.

"After analyzing the toxicants of the deceased's organs and tissues, the deceased's body did contain tetrodotoxin, and the intake greatly exceeded the lethal dose of a normal person." A voice came from the other end of the phone.

"So in this way, can it be concluded that the victim's death was caused by poisoning, rather than the mechanical asphyxiation we mentioned earlier?" Kong Yang asked.

"Yes, I'm sure of this. That... I'm sorry, Team Kong, we didn't discover this doubt in the first place, it was because of our negligence in our work."

"I can't blame you. I can understand this. Now that the truth has come to light, it's thanks to you. That's fine. Just pay attention to your work in the future."

It seems that now is the time to talk to Bu Sifei.Kong Yang pondered in his heart.

In the interrogation room, Bu Sifei sat on a chair in the center of the room, crossed his hands, and closed his eyes tightly. He only opened his eyes when he heard the sound, and watched Kong Yang and Taohua walk in unhurriedly.

After they sat down, Kong Yang handed the test report to Taohua who was beside him.After a while, with Taohua's eyes wide open and a surprised expression, Kong Yang spoke:

"How about noon, are we still in the habit of eating lunch?"

"It's not bad, at least it's better than our school." Bu Sifei nodded and replied.

"No way, there are so many choices in the school cafeteria, but we have no choice but to eat whatever we have, and we are still envious!" Kong Yang laughed easily.

"It's not that there is no choice, but that there is no need to choose. This saves a lot of trouble. Too many choices make people dazzled."

"Yeah, let's get down to business. Now, we want to know something more about you, and I hope you don't dislike us!"

This sentence is said politely without losing majesty.

"Hmm..." Bu Sifei replied softly, and nodded slightly.

"Do you know why we came here for you?"

"I didn't know it at first, but I only found out here in the morning!"

Indeed, this problem also troubled Bu Sifei. He never understood the reason why the police were following him. It was during the interrogation in the morning that he found out that it was because of his shoes.But he couldn't understand how his shoes would leave traces at the scene of the crime, and what was even more incredible was that the murder weapon was actually his shoelaces!He never even went to the tutor's office that day!

"Judging from the situation of the on-site investigation, the deceased was strangled to death, and the evidence at the scene directly points to you and your shoes, but according to the situation obtained in the previous investigation and interview, we found that you did not have time to commit the crime. And from today Judging from the interrogation, it seems that you really don’t know anything about shoes.” Kong Yang paused for a moment, looked at Bu Sifei seriously, then turned to look at Taohua next to him, and suddenly changed the subject, “Forget it , let’s not talk about shoes for now, let’s talk about your graduation project.”

"Problem?" Bu Sifei asked suspiciously.

"Yes, the subject!" Kong Yang repeated, "I remember your subject seems to be about tetrodotoxin?"

"Yes."

"Among all of you, are you the only one whose subject is this?"

"No, because we are the same instructor, so we all are about tetrodotoxin, but the research direction is similar."

"But as far as I know, the fishing and sale of poisonous wild puffer fish are strictly prohibited by the state, and there are also very strict restrictions on the highly toxic substances you purify. How can you still study this kind of subject?"

"You only know one thing, but not the other. Although it is highly poisonous, its medicinal value is extremely high, which makes its market price extremely expensive, and it is also known as the most expensive poison in the world! From any of the above aspects, our research is necessary!" Bu Sifei explained with a little satisfaction, and then frowned, "However, I am not very clear about the specific restrictive measures. I am only responsible for conducting experiments, but I learned from the teacher. I know that we have records in the relevant departments, and he has also formulated strict experimental procedures. In the end, the highly toxic substances produced in the experiment must also be chemically decomposed. Every step of this must be recorded in detail. Accurate, and the second is to ensure the safety of these highly toxic substances. Besides, the amount of materials for each experiment is very small, and you must ask the teacher to apply for it."

"Well, then you must be very familiar with the properties of tetrodotoxin, right? Including the clinical symptoms of tetrodotoxin poisoning."

"Well, I have to understand my subjects, and this is also my job." Bu Sifei was puzzled and seemed hesitant to speak, while Kong Yang just looked at him quietly, waiting for his questions.

"But, does my subject have anything to do with this case?"

"I might as well tell you that we just got the results. We detected tetrodotoxin in the body of the deceased! I think you should know what this means!"

Bu Sifei digested the information silently, his surprise was the same as Taohua's, the difference was that his brows were tightly furrowed, as if he was caught in some kind of worry and panic.

After a while, he took a deep breath, held his cheeks in his hands and gently slid down from top to bottom, then let out a heavy breath, collected himself, and said:

"So, this means that the evidence is solid, and I can't argue with it?" Bu Sifei's eyebrows were deeply sunken, and his eyes were full of pain and helplessness.

"Yes..." Kong Yang prolonged the ending in a mysterious manner, then paused, and said slowly, "No!"

Bu Sifei looked at him suspiciously, and Taohua looked at him equally suspiciously.

"Actually, such a result has created some kind of contradiction: you seem to be the most suspicious, but after thinking about it, it doesn't make sense at all. So I hope you can cooperate with us and think carefully about who was involved before the crime happened. The experiment is not standardized, or it may be private property; moreover, why your shoes appeared at the scene of the crime, and there are biological materials of the deceased on the shoelaces, I am afraid that only you know this, I hope you can give us a reasonable explanation Explain, that is to say, only you can save yourself now. If there is no clue, we can only assume that you are seriously suspected, after all, the shoe is yours, and you can produce poison!"

When saying these words, Kong Yang watched Bu Sifei quietly, his face full of majesty, he hoped that the other party could understand the seriousness of this matter.After finishing speaking, Kong Yang got up and was about to leave. When he opened the door, he turned around and added:

"By the way, you may not be able to go back today! We have provided food and lodging, and we will prepare a separate residence for you. You should also take this time to think about what I just said!"

"No, no, each of us can extract the toxin, why must it be me? Besides, although our research topic is tetrodotoxin, I remember that the instructor once said that no matter the dose we received from him, or our The concentration after purification is not enough to cause death, it is not life-threatening!" Bu Sifei was not willing to stay alone in this small interrogation room, he argued hard.

"Oh? Really?" Kong Yang was puzzled for a while, "We will verify what you said. If it is true, we will only rule out the suspicion of poisoning you, but your shoes..."

In the end, there was only Bu Sifei left.

As soon as he left the interrogation room, Taohua couldn't wait to ask: "Master, have you been waiting for this result this morning? Why did this result come out so late? How did you know there would be this test result? It shouldn't be Does it have anything to do with the suspect's defense?"

This series of questions made Kong Yang unable to answer. Instead of feeling a sense of accomplishment, he felt a sense of loss, because the truth of Bu Sifei's last words has yet to be verified.But considering that Bu Sifei has already stepped into prison with half of his foot, it is meaningless for him to lie at this time.

"Go, call everyone to hold a meeting, and re-discuss the case based on this new clue." Unlike the excited Taohua, Kong Yang ordered with a deadpan face.

Soon, the staff arrived.

"Everyone, this is an autopsy report that I asked my colleagues in the laboratory to do again this morning. According to this report, it can be known that the deceased's body contained a large amount of tetrodotoxin, which means that the cause of death should be poisoning! The reason for redoing Making this autopsy report is completely a coincidence, we happened to participate in a defense in the morning, and one of the research topics was the extraction of tetrodotoxin..." Kong Yang said.

Kong Yang paused for a moment, watching everyone circulate the materials in hand one by one, and before the circulation was finished, he continued: "In this way, the case seems to be more complicated, and it is very likely that we are going in the wrong direction! So now, I I hope everyone will treat this as a new case, and re-discuss your views based on the clues you have so far."

For a long time, no one responded to Kong Yang, because everyone present was shocked and confused by the result, and they were slowly thinking and digesting in their own minds.

Finally, someone spoke up.

"Obviously, the deceased took tetrodotoxin first, and then was strangled to death, but since the poisoning is enough to cause death, why did the murderer take the extra step?"

"Maybe he's trying to cover up something!" Another person answered quickly.

"Cover up the truth of the poisoning? This is their topic, and the shoe prints at the scene are also his, so why didn't he cover up the shoe prints? It should be much easier to deal with a pair of shoes! Now all the evidence points to him , What is the meaning of the so-called cover-up?"

"However, according to Bu Sifei himself, the dose of toxin they received and the concentration of purification are not enough to be fatal. This needs to be further confirmed by investigating their experimental records, but the person is indeed dead at present, and our autopsy report It also clearly stated that it was enough to kill."

There was another silence, and the members of the task force were immersed in their own thoughts, frowning.

Suddenly, a voice sounded.

"Actually, I was thinking, how did the deceased get poisoned? This kind of thing should not be eaten by mistake. If it is in the process of drinking water, it is impossible to put the toxin into the water. One is the timing problem, and the other is the physical characteristics of the toxin. Can this thing be dropped directly into the water without being noticed?"