The next day, Li Shuhan came to the noodle shop early in the morning, and after breakfast, he happily took Fang Yu to the branch.

As soon as the people from the sub-bureau went to work, Fang Yu applied for an autopsy on Zhen Panpan's body.

The formalities were quickly completed, and the forensic doctor performed an autopsy on the part requested by Fang Yu, took a few photographs, and wrote a simple autopsy report.

Then Fang Yu brought Zhen Dan again, and asked a few questions with coaxing.

After these things were done, the report of the teacup extract that was sent for testing yesterday also came out.

When Fang Yu saw the result, his face was overjoyed, and he smiled at Li Shuhan, who had been waiting anxiously: "You can report to the branch leader." ”

Li Shuhan quickly invited the leaders of the sub-bureau and the head of the Criminal Investigation Section Liao to the conference room.

This branch leader also happened to be someone Fang Yu knew. That time he was caught by Song Jianghe and taken to the police station, and it was the leader of the sub-bureau who accompanied the leaders of the city bureau to the Jinhe Road police station to rescue him.

Because the main leaders all knew Fang Yu, Li Shuhan waited for everyone to sit down, gave a brief introduction, and asked Fang Yu to directly start explaining the case.

"Hello everyone, leaders. I won't say much about the basic situation of this case, but I think all the leaders are already very clear. I was invited by Director Li mainly to solve a mystery, that is, the cause of death of the victim Zhen Panpan. ”

Fang Yu first took the wall to project Li Xiulian's confession, "Everyone knows that Li Xiulian herself said that she poisoned Zhen Panpan to death through the toxin produced by eating dog meat and eel. But in reality, it is impossible for dog meat and eels to produce toxins at all. ”

Fang Yu projected the earliest autopsy report, "The report also proves that Zhen Panpan has no signs of poisoning." Then the statement that Li Xiulian's food poisoning killed Zhen Panpan is not valid. ”

Fang Yu then took out Zhen Dan's interrogation transcript:

"Although Zhen Dan said that he fed his father water containing vitamin C, the shrimp Zhen Panpan ate for dinner was not enough to react with vitamin C to produce trivalent arsenic that was lethal."

Fang Yu once again projected the earliest autopsy report, "It is also this report that proves that Zhen Panpan does not have a large amount of arsenic in his stomach. ”

"Sorry for interrupting." Section Chief Liao raised his hand and said he wanted to ask a question.

Fang Yu had long expected that someone would ask a question, so he calmly stretched out his hand and signaled, "Section Chief Liao, please speak." ”

"You said that shrimp and vitamin C do not react to produce trivalent arsenic that is lethal, so what is the explanation for the arsenic in the vomit?"

Fang Yu smiled and took out the test report he had just gotten and handed it to Section Chief Liao: "This is the answer." ”

Section Chief Liao took it over and looked at it suspiciously, "Isn't this still arsenic?" ”

Fang Yu pointed to the report, "Look down carefully, what I asked for testing are two samples. ”

Section Chief Liao looked down again, "It's no different, both samples contain arsenic." ”

"No, it's a big difference."

Fang Yu put on plastic gloves, picked up the teacup as evidence, and showed it to everyone.

The yellow stain on the inside of the teacup is dried vomit, and the rest of the cup is black tea stain.

"The two samples were taken from the part of the teacup that was stained with vomit and the part that was not."

"Huh?" The leader of the sub-bureau was surprised and said, "You mean that the teacups contain arsenic in the first place." ”

Fang Yu nodded and said, "That's right, the reason why the arsenic that exceeded the standard was found in the previous test should be that the tea dirt on the teacup was inadvertently scraped when the sample was taken." ”

"So this Zhen Panpan was actually poisoned by arsenic smearized on the teacup? However, although the arsenic level in the test report was exceeded, it was not fatal. Section Chief Liao immediately pointed out Fang Yu's loopholes.

Fang Yu replied with a smile: "I didn't say that Zhen Panpan was poisoned by arsenic." In fact, the arsenic on the teacup has nothing to do with this case. ”

"It's okay? How the hell did that arsenic come from? Li Shuhan also asked in surprise.

Fang Yu put down the teacup and said with a strange face: "I guess I guess some people here also have this arsenic on their teacups, but it's just more or less. ”

As soon as Fang Yu's words came out, everyone present showed surprised expressions.

Fang Yu didn't sell Guan Zi either, and continued:

"Everyone knows that tea is very susceptible to insects during the growth process, so a lot of pesticides need to be used.

At present, in order to save money, some unscrupulous people use pesticides containing inorganic arsenic that are prohibited by the state. Tea grown in this way will inevitably have a lot of arsenic residues.

If I guessed correctly, Zhen Panpan estimated that he usually drank this kind of tea, so the tea dirt on the teacup left excessive arsenic. ”

As soon as Fang Yu explained this, everyone suddenly realized and nodded one after another.

Fang Yu continued:

"For normal people, it takes more than 5 milligrams of trivalent arsenic to have a toxic reaction, even if a few people have a special constitution and are particularly sensitive to arsenic, it will take at least 20 milligrams or more to cause death.

Although the arsenic content in the tea scale extract is exceeded, that refers to the inorganic arsenic index relative to the normal environment. I carefully read the test report, and the arsenic content in the tea scale did not even meet the poisoning standard, and it was definitely not enough to be fatal. ”

Section Chief Liao interjected: "Didn't you say that Zhen Panpan often drinks tea, is it possible that the arsenic he ingested accumulated in his body and finally died of poisoning?" ”

Fang Yu replied: "What you said makes sense, but people have a certain metabolic function, and drinking tea containing arsenic for a long time is of course not good, it will cause dysfunction and even failure of internal organs, but it will take a long time, like Zhen Panpan obviously did not show similar signs, then there is no possibility of sudden death." ”

"That is to say, neither Li Xiulian nor Zhen Dan were the murderers of Zhen Panpan." Li Shuhan concluded.

"That's the case, although Li Xiulian and Zhen Dan subjectively have a motive to kill, objectively they have not caused actual harm to Zhen Panpan." Fang Yu confirmed.

Section Chief Liao gasped: "Hey, then this case is complicated, the two suspects are not murderers, and the murderer has not yet entered our field of vision?" ”

Fang Yu shook his head: "The murderer of this case has actually been in our sight all along, but no one will suspect him." ”

Everyone originally saw that the two suspects had cleared their suspicions, and felt that the case suddenly fell into the fog again. But when Fang Yu said this, everyone's hearts were shocked.

"It's always in our sight, is it Snow?" Li Shuhan asked in surprise.

Hearing Li Shuhan's words, Fang Yu's face darkened, and after being silent for a second, he said: "The murderer who killed Zhen Panpan is actually Zhen Panpan himself. ”

"What! Are you kidding. Section Chief Liao first stood up and questioned.

"Fang Yu, you made a mistake." Li Shuhan hurriedly returned to the protective road.

Fang Yu was unmoved, and repeated the conclusion just now: "There is no real murderer in this case, Zhen Panpan killed himself." ”

"Don't talk nonsense," Xiao Lu, who was in a meeting together, couldn't help but interject, "Zhen Panpan has no motive to commit suicide at all." ”

Section Chief Liao also said: "Fang Yu, I know that you are eager to help Director Li solve the case, but if there is no basis, it is better not to say it casually." ”

Fang Yu had a faint smile on his face, but his eyes looked at the leader of the sub-bureau.