4 PM on October 2nd.

Li Nan was somewhat anxious and, unusually, took the initiative to enter the laboratory.

"Xiaowen, have the results come out yet?"

Qin Wen glanced at Li Nan, who had entered the lab in her green uniform, and silently thought, "Doesn't she have any common sense at all!"

"Let's talk outside!"

At the laboratory entrance, Qin Wen took off her mask. "Part of the autopsy results are out. The situations are largely the same: poisoning. The toxin is a rare biological toxin called ricin."

Li Nan scratched his head sheepishly, "What kind of poison is this?"

Qin Wen rolled her eyes at her ignorant son and explained, "Ricin is a very rare biological toxin. A biological toxin is one that is synthesized by the organism itself and has no negative effects on the organism. However, if it is accidentally ingested by other organisms, it will activate its toxicity. Under normal circumstances, the toxicity is very strong."

"Oh, this is like a living organism's self-protection mechanism!"

"It seems that Li Shazi isn't so stupid after all."

"That's a must!"

Qin Wen continued, "This absinthecin was discovered accidentally by Professor Hu, a Chinese scientist, more than ten years ago in a hybridization experiment between absinthe and castor bean plants."

"This toxin is located in the roots of the original plant, buried deep in the soil. Its biotoxicity is very unstable and it is difficult to exist for a long time in an aerobic environment. It can only exist in anaerobic and hypoxic environments. Once the oxygen content (DO) value is greater than 0.8, this toxin will decompose."

Qin Wen looked at Li Nan, who was starting to look confused, and really had no idea what to do. What a stupid teacher he was! How did he even get into the Anding Division and become a rising star among police officers?

It's more like a gorilla, right? Yes, it's that head-scratching gesture right now, it's exactly the same.

"Initially, based on the victim's appearance—internal organ ulceration and massive bleeding—I suspected it was a potent poison. Conventional testing methods yielded no results until I remembered my mentor mentioning this poison. I then used a sealed extraction method and confirmed it was indeed this toxin!"

Do you realize how risky it was for you to just go in without any protective gear?

Li Nan chuckled sheepishly, "I won't do it again!"

"So, honey, have you found out where this ricin came from?"

During their conversation, the two had already returned to Li Nan's office.

Qin Wen looked incredulous. "That's the strange thing. After I confirmed that the toxin was castor bean, I tested other evidence I brought back from the milk tea shop using the same method, including oranges, tea leaves, powdered sugar, etc., and I didn't find a trace of the toxin!"

"Be careful of your stupid husband's intelligence," Qin Wen added, "Of course, we didn't even spare the original milk tea. We tested it according to the strictest testing requirements, and we couldn't find anything! Moreover, to ensure the comprehensiveness of the experimental results, I used four groups of mice to test various experimental combinations. Before you came, except for one group that had slight diarrhea, the other three groups were all normal!"

"So, these ingredients and the milk tea shouldn't contain any toxins?"

"At least based on the current conclusions, that is indeed the case!"

"That's strange. Where did this poison come from? Could we be heading in the wrong direction?"

"It's too early to draw conclusions. I'll rest for a while and then continue examining the body to see if there are any other possible causes!"

"Okay, thank you for your hard work, my dear wife!"

"Try your best tonight too!"

...

As prime suspects, the three people from the Rumeng Milk Tea Shop were taken back to Anding Division for further questioning.

After the other shops on the pedestrian street retrieved the necessary suspected evidence and completed the on-site questioning, everyone was allowed to leave, and the cordon was removed in the afternoon.

It's currently the National Day holiday, a peak sales period for vendors, and this sudden poisoning incident yesterday has severely impacted their businesses.

With the frenzied publicity from news outlets and social media, the An Ding Si is now in a very passive position and must find the cause of the poisoning as soon as possible.

Currently, the patrol and the stability department have received many complaints, and Xiong Sifu is already overwhelmed by them.

Li Nan dared not risk this misfortune and decided to look for clues in other directions first.

Currently, Yang Bairong is in charge of further questioning the employees of Rumeng Milk Tea Shop and Huo Houming. Li Nan's intuition tells her that there probably won't be any results.

Looking at Huo Houming, who was looking dejected in the interrogation room, Li Nan felt an indescribable sense of satisfaction and wished she could secretly take a couple of photos and send them to Gao Siming.

Oh, right, this case is also related to Gao Siming. Should we go to his place again for a better meal?

Li Nan shook his head. Forget it, he'd wait until things calmed down before taking his wife along.

Ever since Qin Wen was taken to Gao Zimin's orchard a while ago, this little girl has become friends with Sister Zimin, and they've now become best friends.

I want to go see Gao Siming, but if I don't bring her along, sigh, what about my position in the family!

Li Nan found Li Na, who was concentrating on organizing data, and her head ached just looking at the dense data on her computer.

"Li Na, have you found anything here?"

Li Nan's sudden appearance startled Li Na. After calming her turbulent emotions, Li Na took a breath and said, "According to the sales data of the milk tea shop, just yesterday, 1,107 servings of this Cherry Blossom Cloud Dream Tea were sold. After verification, all 101 people who were poisoned had purchased this milk tea, and the poisoning time was between 6 pm and 11 pm."

"This timing is very important!"

Looking at Li Na, Li Nan pondered for a moment and said, "Li Na, I'm going to give you another challenging task!"

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