Animal Detective

Chapter 416 Kindness
Old Lü's name is Lü Yajun.

When Shen Xin and his companion arrived, the person had already left after get off work.

After making the call, he immediately turned back.

"Fipronil?"

Lu Yajun, in his fifties and wearing glasses, frowned immediately after hearing the situation.

He gestured for the two of them to sit down.

He knew very well about Fu Lanting's poisoning case; he was the one in charge of the toxicology testing back then.

He also knew that Shen Xin had reopened the investigation, and Ding Yuwei and the others had come to inquire about the situation more than once before.

But unexpectedly, the investigation has now reached Guo Jinhua.

After thinking for a moment, Lü Yajun said, "It should be fine."

"After entering the body, fipronil is rapidly metabolized into fipronil sulfone and fipronil sulfoxide, among which fipronil sulfone is the key detection target."

"This thing has an extremely stable chemical structure. It is highly lipophilic and should accumulate in liver fat. Low-temperature storage, like in our laboratory, at minus eighty degrees Celsius, will further reduce its degradation."

"So even if it's been two years and eight months, I think it can still be detected."

"And it's not just Fu Lanting, but also Guo Jinhua. We also drew his blood back then and kept the sample. Maybe we can detect fipronil in it, which should be helpful."

Shen Xin thought to himself, "Of course there is. It proves that the two of them were poisoned by the same drug."

Lu Yajun continued, "Fluorfenicol is a phenylpyrazole nerve agent that acts on the central and peripheral nervous systems."

"Based on the amount you mentioned, the symptoms should be milder, and they will overlap somewhat with the symptoms of bromadiolone poisoning."

"For example, numbness in the hands and feet, dizziness and nausea at the beginning."

“I remember that Guo Jinhua had severe nerve damage and memory loss, which may also be due to the effect of fipronil.”

At this point, Lü Yajun stopped talking and got up to put on his white coat, saying, "Wait for my report."

He glanced at the wall clock and said a time: 12 hours.

The detection technology itself is not difficult, but frozen tissue samples require preprocessing, which takes more time.

But it's fast enough, considering it's a criminal case; we have to get it done even if it means working overtime and staying up all night.

Shen Xin thanked him and then called Zhang Hancheng to report the situation.

"Sure, Shen Xin."

After hearing this, Zhang Hancheng exclaimed in surprise.

The potential motive was just discovered, and the source of the poison was found so quickly, with the hope of obtaining a toxicology report.

Zhang Hancheng has been a criminal police officer for many years, working his way up to the head of the criminal investigation branch, and has handled countless cases.

There are very few cases that can be left unsolved.

He was thinking about everything, one thing at a time.

Now that there is hope of solving this poisoning case, how could he not be excited?

However, it was precisely at this time that Zhang Hancheng knew he couldn't celebrate prematurely.

He quickly thought for a moment and said, "Shen Xin, we need to investigate Qiongzhou thoroughly, especially to find out who sold this bottle of rat poison to Guo Jinhua in the first place."

“Now that you’ve put in the effort, go all out and investigate Guo Jinhua’s whereabouts in Qiongzhou. My personal guess is that he probably bought it in some remote place near the hotel.”

"Because these illegal products, which claim to be high-tech, are often sold at street stalls."

Those kinds of farmers' markets, or the entrances to residential areas, they set up stalls, put up all sorts of exaggerated advertising slogans, and their main business is to hit and run, and then move on to avoid getting caught.

This also saves the trouble of selling counterfeit medicine that has no effect and being sued by the buyers.

“Since the manufacturers were investigated, we investigated their sales channels, going down level by level, and compared them with Guo Jinhua’s movements. If they matched, we verified them.”

"When we went through airport security, he said that the purchase was quite expensive, which means that the seller sold it at a high price, probably thinking of scamming as many people as possible."

"So the number sold may not be large, but the seller may remember it."

"In short, we must find out the source of the rat poison so that we can lock down Guo Jinhua."

Shen Xin noted it down.

On the way here, Shen Xin had already thought about how important it was to find out the source of the rat poison.

Because of this case, it's difficult to determine the method and tools used for poisoning, so we can only focus on rat poison.

Shen Xin just asked Lü Yajun.

I know that fipronil, like bromadiolone, can only be decomposed and destroyed at high temperatures.

Back then, a large number of samples were taken and tested in the kitchen and Guo Jinhua's home, but none of them tested positive for bromadiolone.

This is actually a major reason why Guo Jinhua was not suspected back then, and why no reasonable way of poisoning could be figured out.

If Guo Jinhua was the one who poisoned the animals, he would definitely have cleaned the equipment afterward.

Conventional methods are rarely enough to completely clean it up. Not to mention that he was poisoning people over a long period of time.

That's why the task force racked their brains back then to speculate on all sorts of unbelievable ways of poisoning.

Shen Xin had actually considered this issue after suspecting Guo Jinhua of poisoning the animals.

It is possible that Guo Jinhua used disposable instruments.

They basically eat all three meals at noodle shops. What if they want to use disposable takeout containers for convenience?

They poisoned the food, ate it, and then threw it away far away. The time between poisoning and the discovery of the crime was long, making it impossible to retrieve the discarded trash.

Therefore, the only way to identify Guo Jinhua is through rat poison and by applying the principle of exclusivity.

Therefore, once the investigation into the rat poison case is completed, Guo Jinhua can be arrested immediately.

As for why he poisoned the animals, that's a question that will be addressed after his arrest.

Now that the source of the rat poison has been identified, the people shaking things out in Pingyu can withdraw.

Everyone is busy.

Now we just need Yang Zeran to keep trying and see if he can find the seller.

The next day, Lü Yajun successfully produced a toxicology report.

Fipronil was definitively found in Fu Lanting's tissue sample.

The same substance was also detected in Guo Jinhua's blood.

Now everything is ready, all we need is the east wind.

It has to be said that having connections makes a difference. Colleagues in Qiongzhou put in a lot of effort, investigating layer by layer, and a few days later, they actually found it.

On July 13, two days before Guo Jinhua and his family of three left Qiongzhou, they went to a seafood market in Yazhou to buy seafood, intending to enjoy a fresh and delicious meal.

A mobile vendor named Huang Shaolong was selling rat poison outside the market.

It claims that one bottle, when diluted, can last for three years, and that just one drop can kill all the rats and pests in your home.

Imported high-tech ingredients, exclusive formula, special offer, only 198 per bottle.

This guy uses the same old tricks as those selling knives and cleaning cloths, even giving a live demonstration: after diluting the ingredients, he feeds them to the rats and cockroaches in the cage, and the rats die within minutes.

This demonstration attracted a large crowd to watch the spectacle.

Huang Shaolong remembers Guo Jinhua.

He remembered it because Guo Jinhua and his family of three were also attracted and watched from the crowd.

Then, perhaps seeing the rats convulsing and dying made Guo Meijing, who was on the verge of death, unable to bear it any longer. She begged Huang Shaolong to let the rats go.

She even begged Guo Jinhua to buy all the rats and release them back into the wild.

Guo Jinhua actually agreed and discussed buying rats with Huang Shaolong.

Huang Shaolong treated him like a fool, so naturally he wouldn't sell.

Fu Lanting chimed in, saying that Huang Shaolong was too cruel, even children couldn't bear to watch.

They even had an argument because of it.

Because of this, Huang Shaolong developed an impression of Guo Jinhua.

More importantly, about two hours after the argument and the three of them left, when Huang Shaolong was about to pack up his stall, Guo Jinhua returned alone.

Huang Shaolong thought Guo Jinhua was there to start a fight, but to his surprise, Guo Jinhua bought a bottle of rat poison from him and carefully inquired about how to use it and how toxic it was.

Huang Shaolong recalled that Guo Jinhua even asked people what would happen if they accidentally ate it.

A conscientious seller might become suspicious upon hearing such a question.

But Huang Shaolong didn't, he simply said it was best not to eat it.

Moreover, Huang Shaolong recalled that Guo Jinhua unusually sniffed the smell before making the purchase.

They didn't even haggle over the price.

Huang Shaolong was reported and punished for selling counterfeit medicine.

Yang Zeran had already shown him the photos and confirmed that it was indeed Guo Jinhua and his family of three.

In this way, the source of the rat poison, its sales channels, and how it ended up in Nanjiang have all been thoroughly investigated.

In this situation, even if Guo Jinhua vehemently denies it, it would be enough to form a complete chain of evidence to confirm that he poisoned and killed Fu Lanting.

Shen Xinwei was somewhat moved that Huang Shaolong was able to remember Guo Jinhua because of Guo Meijing.

Because of Guo Meijing's kindness, she couldn't bear to see those rats being poisoned to death.

Looking back on the whole case, I feel that the fact that it was solved was related to Guo Meijing's kindness.

The reason why He Liyuan still remembers Guo Meijing is because she was a good girl, and the wish she made is something she has always remembered.

(End of this chapter)