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Open it and pour out a slice, Fang Ze sniffed it carefully.

Apart from a slight sour taste, there is no suspicious smell.

"It's vitamins"

"What is he eating this stuff for?"

Shen Kaidao: "I asked a question at the time, and he said that surgeons often work overtime, and the body lacks nutrition."

"So he has a habit of taking vitamins."

"It's his own thing, so I don't care."

Fang Ze asked, "What time do you eat?"

Shen Kai thought for a while and said: "About four o'clock."

"Two hours?"

Fang Ze fell into deep thought.

Shen Kai waited for a while, but Fang Ze couldn't speak, so he couldn't help asking: "Team Fang, is there a problem with vitamins?"

Fang Ze said softly: "There is nothing wrong with vitamins, it's just"

He didn't finish.

At this time, Luo Bixin said: "Let's test the residue in the stomach, and there will be an answer soon."

Fang Ze didn't speak, but turned his gaze to the trash can beside the desk.

Since they found Zheng Xuyao ​​yesterday, the trash can hasn't been emptied yet: too.

"Give me the gloves."

Fang Ze stretched out his hand.

Behind him, a criminal policeman hurried forward, handed the gloves to Fang Ze to put on, and squatted in the trash can to search.

After a while, he took out a lunch box.

"This is not what you ordered"

Fang Ze turned his head to look at Shen Kai.

Shen Kai shook his head and said: "No, Zheng Xuyao ​​should have eaten it yesterday."

"Ok."

Fang Ze opened the lunch box, and there were still food residues inside.

He leaned over and sniffed it carefully.

After a while, his expression froze.

Although the smell is very weak, Fang Ze can still distinguish it.

"Potassium arsenate!"

Hearing Fang Ze's words, Shen Kai asked strangely: "Fang team, is potassium arsenate poisonous?"

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Fang Ze threw the lunch box back into the trash can, stood up and said, "There is potassium arsenate in Zheng Xuyao's diet."

"This shadow is not simple."

In the office, several people looked at each other, not knowing what Fang Ze meant.

Luo Bixin said: "Fang Ze, are you saying that Shadow was poisoned yesterday and only had an attack today?"

"Just around six o'clock"

“The card is so accurate”

"How is this possible?"

Fang Ze turned around and said, "It didn't just happen today."

"Potassium arsenate is poisonous, but not strong, and generally does not cause physical discomfort."

Hearing this, Luo Bixin was even more puzzled: "How did Zheng Xuyao ​​die when he was slightly poisonous?"

Fang Ze took a light breath, shook his head and said, "We have met a very powerful character."

"Potassium arsenate is slightly toxic."

"Vitamins are non-toxic.

"But if the two are mixed, there will be a slow chemical reaction to form trivalent arsenide."

"These trivalent arsenic compounds are highly toxic."

"The most representative trivalent arsenic compound is diarsenic trioxide."

"Do you know what arsenic trioxide is for?"

Fang Ze looked at Shen Kai and Luo Bixin.

The two shook their heads, expressing complete ignorance.

Fang Ze sighed: "Arsenic trioxide is the main component of arsenic."

"what!"

The faces of the two changed.

Shen Kai quickly said: "Fang team, you mean that the shadow poisoned Zheng Xuyao ​​yesterday."

"He checked very clearly and knew that Zheng Xuyao ​​has the habit of taking vitamins, and the time is around four o'clock."

"In this way, he can make Zheng Xuyao ​​commit suicide by taking poison in disguise without any effort and without showing up in the hospital!"

Fang Ze nodded slowly.

After being affirmed, Shen Kai took a deep breath.

This shadow is too scary! It can be said that there are no omissions! Before the black card was left, the murder plan was already being prepared.