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After Fang Ze lit it for him, he lit another one for himself.

Slowly exhaling a puff of smoke, he looked at Guo Peng and said, "You tell me, or I'll ask."

Guo Peng was silent for a while with a cigarette in his hand, and said, "That's right, I killed Zhang Mao."

"You guessed it right, the murder weapon is ice."

"Can I ask how you know that?"

Facing Guo Peng's question, Fang Ze replied very simply: "Autopsy."

"Whacking a person's body with an ice cube will definitely leave marks in the wound."

"I'm talking about traces, which are material components."

"The ice was already melting when you killed."

"Then the liquid component will of course remain in the internal tissues."

"As long as the ion detection is performed, the result can be obtained."

After listening to Fang Ze's words, Guo Peng said in surprise: "Ion detection"

"You infer ice from the detected ions"

"yes."

Fang Ze nodded and said, "There are no ions in hard solids, that is, in non-crystals."

"Only after the liquid solidifies, will there be ions remaining, which are crystals."

"Ice belongs to the category of crystals."

"And it is still a very strong crystal under low temperature freezing.

"As long as the strength is strong enough and the position is weak enough, it can kill a person."

Listening to Fang Ze's technical terms from time to time, Guo Peng fell silent again.

In fact, it doesn't sound complicated, it's nothing more than some middle school chemistry knowledge.

But the reasoning ability required in it is not possessed by ordinary people.

After a while, Guo Peng looked at Fang Ze and said, "I didn't expect Team Fang,

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Still an excellent forensic doctor."

Fang Ze chuckled lightly: "Solving a case requires a lot of skill."

Guo Peng was noncommittal.

"knowledge is power"

This sentence is definitely not casual.

"Go ahead."

Fang Ze opened his mouth.

Guo Peng took a drag on his cigarette, forced a smile, and said, "I don't think there's anything else to say."

"The process you deduce is basically the same."

"I put ice cubes in my bag, and when Zhang Mao wasn't paying attention, I smashed him to death from behind."

"Then, melt the ice in the bathroom."

"It's that simple."

Fang Ze stared at Guo Peng for a while, then smiled and said, "That's not what I asked."

Guo Peng looked up: "Then what do you want to ask?"

Fang Ze shook his head and said, "It's all over now, don't play tricks."

"I'm asking about motives."

"It's you who said about Zhang Mao's son, or I'll investigate."

"Don't challenge my endurance."

At the end, Fang Ze's voice became cold.

Hearing these words, Guo Peng's finger holding the cigarette trembled slightly.

He bowed his head and fell into silence.

Fang Ze was not in a hurry, he just waited silently.

After a while, Guo Peng sighed deeply and said, "How did you come up with this?"

This sentence has already admitted this matter in disguise.

Seeing this, Tai Wei subconsciously turned his head to look at Fang Ze, with surprise in his eyes.

Like Guo Peng, he is also curious.

How did Fang Ze know? Fang Ze flicked off the cigarette ash, and said calmly, "To be honest, I really guessed."

"Because you don't have any motive to kill Zhang Mao."

"I can only think about other points."

"After all possibilities have been ruled out, only one last possibility remains."

"That's the truth."

"Killing Zhang Mao will do you a lot of harm but no benefit."

"You wouldn't do it unless you had to."

"Unless, he must die."

"Coincidentally, when chatting with Li Ruisi, he mentioned it casually."

After listening to Fang Ze's words, Guo Peng couldn't help swallowing.