"According to the test results of our physical evidence identification laboratory, the drug in the bag is clearly high-purity sodium cyanide." Su Ping said: "In the body of the deceased, a fairly high concentration of ...... was also detected in the blood."

"Impossible!" Zhang Yuntong interrupted him and said in a panic: "Where did I get sodium cyanide?" What I gave was obviously amoxicillin, which was prescribed in the school doctor's office! ”

As a chemistry student, she also knows exactly what cyanide means.

"How do you prove it?" Xun Mu asked.

"Monitoring, I'll give it to him here, you go check the monitoring!"

"But according to what you said," Su Ping said indifferently, "you had already put the pills into the smallest sealed bag at that time. How do we ...... just one pill?"

Hearing him speak, Zhang Yuntong's face quickly darkened.

Yes, many pills look the same, so how can it be proved that she gave amoxicillin instead of sodium cyanide?

On the contrary, surveillance could photograph her handing over the sealed bag to Sun Weitian, but sodium cyanide and cyanide ions were detected in the sealed bag and the deceased's body, respectively.

With this, her criminal behavior can be confirmed, and it can't be explained clearly.

However, Su Ping suddenly paused in the middle of speaking, frowned and thought for a moment before asking, "Did you wear gloves when you handed the pills to Sun Weitian?" ”

"Gloves? No, what gloves do I wear on a hot day! ”

"That's good!" Su Ping clapped his hands, looked at Xun Mu, and said, "Fingerprints!" Do you remember that in the sealed bag, there are and only Sun Weitian's fingerprints! ”

Seeing Xun Mu nodding, he said again: "Hurry up and let Xiao Chai go to the Physical Evidence Section, carefully investigate the physical evidence bag, and re-separate the overlapping fingerprints for verification many times." ”

After speaking, he looked at Zhang Yuntong and said softly: "As long as the identification results still have and only Sun Weitian's fingerprints, combined with the surveillance video, your suspicion can be preliminarily ruled out." ”

As soon as Zhang Yuntong breathed a sigh of relief, he listened to him continue: "But it's just a preliminary exclusion. If the sealed bag is too small, there will not be many fingerprints left on it, and it may be erased and eliminated if you are not careful.

After all, you have given Sun Wei medicine, and there is no way to prove what you gave at present, in this case, it is impossible to completely rule out suspicion with a fingerprint. ”

"That's right." Xun Mu put down his mobile phone and answered: "To be honest, with the current evidence, we are enough to directly make a decision to detain you." It's just that we don't want to wronged anyone, so we choose to believe you, and we ask you to cooperate with our investigation......"

"Don't worry, I will cooperate." Zhang Yuntong shook his head again and again.

In fact, looking at Zhang Yuntong's contrasting performance before and after learning of the death of the second Junyan, the two became a little suspicious, and Zhang Yuntong's fingerprints did not exist on the sealed bag, which made them choose to believe Zhang Yuntong.

And if she didn't kill anyone and didn't know about it, then where did the sodium cyanide in Sun Weitian's hand come from?

Xun Mu wondered for a moment whether it would be Sun Weitian who set up a bureau to frame Zhang Yuntong.

But this idea was quickly ruled out by himself.

First of all, looking at Sun Weitian's performance, he didn't know that the second Junyan would die, otherwise he wouldn't have made an aggressive move to splash people with hot pot in the future;

Secondly, the framers often try to get themselves out of the case, so how can they do it themselves?

Otherwise, regardless of whether the planting is successful or not, he himself will at least be charged with manslaughter.

In other words, Zhang Yuntong's suspicion can be preliminarily ruled out, Sun Weitian has no subjective intention to kill, and the two are not negligent, Zhang Yuntong gave the anti-inflammatory drug amoxicillin, while Sun Weitian invested sodium cyanide......

Obviously, after Sun Weitian got the medicine, before the poisoning, the medicine in his pocket was obviously changed.

In this case, the murderer behind the scenes must meet two conditions.

First, he knew that Sun Weitian had medicine in his pocket and would use it; Second, he had to have the intent to kill or frame a false accusation, targeting one or more of them as Second Junyan, Sun Weitian and Zhang Yuntong.

After quickly clarifying his thoughts, Xun Mu asked: "Ms. Zhang, the first question, who has a conflict with the second Junyan?" ”

"Me." She thought about it for a while, and then said with a complicated face: "First of all, it's me." ”

"Oh?" Xun Mu looked at him with some curiosity.

After he asked Sun Weitian last night, he knew that Zhang Yuntong and the second Junyan had an unknown contradiction, and she was only surprised, surprised, panicked but not sad when she heard the news of the death of the second Junyan, which can also prove this.

Therefore, about the contradiction between the two of them, he would have to ask sooner or later, but he didn't expect Zhang Yuntong to say it so directly.

After thinking about it, he also understood Zhang Yuntong's thoughts - she wanted to show her "sincerity".

Nodding, Xun Mu said again: "Let's talk about it." ”

"In the beginning, we had a really good relationship." Zhang Yuntong's eyelids drooped, and while recalling, he said: "When I entered the freshman year, because there were few girls in the class, and only the two of us were assigned to the same dormitory, we quickly became friends.

She knew that my family was not very good, and she took good care of me, and I am very grateful to her. But slowly it changed its taste.

There are many reasons, one is a problem with my personality, I was a little inferior at that time, plus I had a soft mouth and short hands, and I was taken care of by her a lot, so I naturally felt a little unable to raise my head and stiffen my waist in front of her, so I thought about how to compensate her and help her do something.

And she has a strong temperament, sometimes the tone of her voice will be more impulsive, and she slowly takes it for granted that I help her do things, and after a long time, there is a little bit of a master-slave relationship between the two of us, and she calls me around.

The contradiction was buried step by step, and slowly, we both looked at each other very unpleasantly, but they both pretended to have a good relationship, the kind that smiled and rolled their eyes when they met.

In fact, we both know this contradiction and each other's thoughts, a dormitory, look down and don't look up, who can hide from whom.

Girls and some of the more sensitive male classmates can actually see that we both speak ill of each other behind our backs, but some of the more sluggish boys probably don't know. ”

"That's all?"

"That's all." Zhang Yuntong sighed: "To put it bluntly, it's not a big deal, but the contradiction has already arisen, so I can't let it go, and there is always a thorn in my heart."

This time, she got married and notified me to go to dinner, but in fact, it was just a formality, so I just pushed it off. ”

Xun Mu thought thoughtfully, took a sip of coffee.

The contradiction between the two of them is not big, but it is not small, in short, it is just plastic sisters, and there is no need to continue to study it after figuring it out.

Then he asked, "What about but you?" ”