Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 514 Changing the direction of case handling
Two clues?

Just now, Qin Yong was worried that there was no clue left, but Lu Chuan suddenly gave out two important clues.

"Xiao Lu, tell me quickly, what clues are there?"

Of course, it was impossible for Lu Chuan to show off at this time, so he turned on his laptop, connected it to the projector, and started playing.

"First, tetrodotoxin was not found in the steamed buns, nor was it found in the vegetables used to make the vegetable soup, but we detected tetrodotoxin in the vegetable soup."

at this point……

Lu Chuan spoke quickly and briefly, and did not say much, but the information revealed here made everyone think deeply.

Nothing is found on the steamed buns or vegetables. What does it mean?
If tetrodotoxin enters the construction site canteen from the outside, then there are basically only two possibilities, either on the steamed buns or on the vegetables.

This is why Qin Yong asked the action team to investigate the Aihui Farmers Market.

But the test results Lu Chuan now received were that tetrodotoxin was not found on the steamed buns, and that no tetrodotoxin was found on the vegetables used to make the vegetable soup.

This means that tetrodotoxin does not enter the canteen at the construction site through these two channels.

And if tetrodotoxin is not external, it should come from within.

Toxins were detected in vegetable soup, which proves this point.

But Wu Guichun made the vegetable soup himself, would he poison himself?

Wrong motive!

Wu Guichun had no reason to poison. As the owner of the canteen, he was the first beneficiary of the canteen's interests. Only when the canteen was good could he make money.

If he has a conflict with some workers and wants to kill them, and he has tetrodotoxin in his hand, one-on-one poisoning can achieve the goal. There is no need to put the toxin in vegetable soup to cause widespread food poisoning. .

Moreover, tetrodotoxin is colorless and odorless and will not be noticed at all after being sprinkled.

So, who is it?

Everyone looked at Lu Chuan, waiting for his next report.

"Second, everyone, look at this picture."

Playing on the projector was an enlarged picture of a milky white mass.

"This is what we found at the bottom of the vegetable soup pot in the canteen where the crime occurred."

"We have just contacted Wu Guichun. The vegetable soup he makes is vegan and does not contain meat."

"But we detected the presence of meat in the bottom of the vegetable soup pot."

"Just after testing, it can be determined that it is the outer skin and part of the internal organs of a puffer fish."

Skin and guts?
Most of the toxins carried by puffer fish are concentrated in the liver, with a small part in the skin.

But there are no toxins in puffer fish meat.

"From the remnants of the pufferfish's skin and part of its internal organs, it can be inferred that the way the other party poisoned them was not to directly extract the toxin, but by putting the pufferfish's skin and part of its internal organs into the vegetable soup pot, causing the pot of vegetable soup to Contains toxins.”

Qin Yong naturally understood what Lu Chuan meant: "You mean someone deliberately threw the puffer fish's skin and internal organs into the vegetable pot to poison it?"

Lu Chuan nodded affirmatively: "From the motive of committing the crime, the possibility of Wu Guichun himself poisoning and harming others is very small."

"But if workers who had breakfast were poisoned, the possibility is higher."

why?
There is a question in everyone's mind.

Why do workers poison themselves?
But there seems to be no other reason to explain it.

Lu Chuan continued to report: "Well, according to the current survey results, those who eat in the canteen in the morning are all workers on the construction site." "I wonder if we can start from this aspect. First of all, pufferfish is not very easy to eat. It can be done.”

"You can check the origin of the pufferfish."

"I agree with Lu Chuan. Wild puffer fish are very difficult to obtain. If the other party can obtain such a thing, the source can be carefully investigated."

Zhang Hui straightened his back, frowned and looked at the photos in the projection seriously.

"And there's another point that we missed during the morning's investigation."

"During the morning investigation, we focused on the social relationships of Wu Guichun, the owner of the canteen, and the social relationships of the suppliers of steamed buns and vegetables to the canteen."

"Whether it is Wu Guichun or the suppliers in the Aihui Farmers Market, the possibility of conflict with the workers is actually not high."

"So if a dining worker was poisoned, can we investigate from the following two aspects?"

"First, check to see if any workers have had conflicts recently."

"The other party used tetrodotoxin for poisoning. The purpose was very simple, just to kill people."

"So among the workers who had dinner today, checking which ones had particularly violent conflicts can be a breakthrough."

"The second question is, have there been any conflicts between workers and the construction site?"

"In such a large-scale poisoning case, the possibility of the other party targeting one or two people is actually not high. If the poisoner has a conflict with someone, then it is enough to poison the other person directly, but he poisoned such a large-scale Poison, is it possible that it’s because of a conflict with the construction site?”

"Well, I think this analysis is OK."

"Yes, if it was a worker who was poisoned, then our previous investigation direction is indeed a bit biased."

This is how it is to solve a case. The direction is very important. If the direction is wrong, the case will become more difficult to solve.

Because the poisoning case occurred in the canteen, everyone will naturally focus on the canteen itself during the preliminary investigation.

The reason why the criminal investigation detachment focuses on the canteen itself is ultimately due to the canteen's interests.

Now Lu Chuan's test results can basically confirm that the poisoner is a worker, so the conflict of interest between workers and workers, workers and the construction site is also a point of contradiction.

Qin Yong knocked on the table and looked around: "Do you have any other suggestions?"

Everyone shook their heads. Lu Chuan's appraisal analysis determined that the criminal subject might be a worker.

Then what Zhang Hui said next is correct.

Conduct investigations around the interest relationships between workers and between construction sites.

"Okay, since everyone has no objections, let's divide our forces into two groups."

"The first group, Sun Jun, takes the lead, and the operations group is responsible for investigating whether there are any unstable conflicts at the construction site recently."

"Another group, Zhang Hui, will lead the team to investigate the source of the puffer fish."

If it's just tetrodotoxin, it's not particularly easy to detect.

Because after being refined, tetrodotoxin can come from anywhere.

But puffer fish are different.

Compared with buying and selling tetrodotoxin, the origin of a pufferfish is relatively easy to trace, especially wild pufferfish.

Wild puffer fish do not grow in the waters around Haizhou City, and there are only a few restaurants in Haizhou City that do puffer fish business.

It's easy to check.

(End of this chapter)