I changed my clothes and went to school with him, and this time we were confident and decided to take He Xiong back to the police station.

"Why don't you let us in, you give me the phone, and I'll talk to your headmaster."

We were only one door away from the school, and the security guards didn't open the door, so we had nothing to do.

"The headmaster said that no one could enter without his instructions."

"We didn't show it to you, we came to investigate the case, why are you so axial."

The security guard at the door looked dark, and he spoke in dialects, which must not be ours, but he was very strict in his work, and even if we had a one-sided acquaintance, we still had to wait for the principal to speak before I was willing to let me in.

Li He was in a hurry at the door, I stood aside, thought for a moment and said, "In this way, don't worry first, let's ...... first"

He thought he could, and began to cooperate with me as much as he could, and turned to see that the security guard was stretching his neck and eavesdropping on us.

I squeezed my eyes and looked at him, and Li He did as we said.

"Don't let me in, then I'll wait here for your principal to come out, he always has to go home, it's okay, I can afford to wait."

Li He got in the car and sat to sleep, and I went to the nearby store to buy water, and at this time, the car suddenly slid backwards.

I shouted, "Someone! Help me block that car. ”

Looking back at the security guard, who was already looking at the door, it was easy to slide because it was a bit steep, and not far below, there was a three-way intersection, which would turn into a car accident if you were not careful.

I chased the car, and the security guard swooped and ran past me, and I stopped and asked someone else for help.

When several men saw it, they hurriedly helped to resist the back of the car, and when the security guard came to open the door, he directly dragged Li He down and pulled the handbrake.

Wiping the sweat from his forehead, he said, "You can't ......."

Li He was already running in my direction, and I stood at the school gate, opening the gate and waiting for his arrival.

He said unceremoniously: "Help me park the car, and when I come out in a while, I am thanking you." ”

Li He and I ran into the school like this, sweating profusely, and went directly into the principal's office.

"You guys, who let you in!"

From the headmaster's stammering tone, we knew for sure that the rules he had set at the door were aimed at us.

Li He wiped the sweat with his sleeve, stepped forward to drink the mineral water on the table, and then took out the piece of paper from his bag and said, "This time, I'll see what you say!" ”

The principal sat in his chair and was silent for a long time, saying, "You can check, but you have to wait until all the students are out of school, I don't want parents to come to the school to make trouble, and I don't want to play this boring trick with you." ”

Hearing the principal say this, we immediately felt confident, and sat in the office and patiently waited for the students to get out of school.

I suddenly remembered which two of my classmates and said to the principal, "Can I talk to your students here?" ”

The principal was about to open his mouth to refuse, but Li He knocked on the execution order on the table, "Yes, but you can't say anything about the teacher and the school." ”

I said yes, and the principal took me to find the two boys.

When they sat in the principal's office, it was obvious that they were a little too nervous.

"It's okay, I'm just here to chat with you guys and drink water, just like I'm in my own home."

One of the boys, Wang Yu, seemed a little more calm, and I tried to communicate with him first, "Have you encountered anything lately?" ”

Wang Yu remembered what He Xiong said, so he naturally said: "Indeed, because Han Zheng's parents have been quarreling a lot recently, he always lives in our house. ”

"Oh, what about you and your classmates or friends outside of school?"

"Friends are like that, we don't know anyone outside of school at all, uncle, we're not the kind of bad students you think."

"Of course I didn't mean that, it's just ......"

My question was interrupted by the principal's cough, and I said in a different way, "So what have you been doing lately?" ”

"Studying, going to school, eating, sleeping, doing homework, so there are only a few things that students can do every day."

Han Zheng's sudden opening made me find a breakthrough again.

"You don't have any hobbies or anything like that? Or is it going to cram school, interest class or something? ”

"Uncle, we are already students in the third year of junior high school, and our school life is already very stressful, how can we bear it with this."

Li He was a little impatient when he listened to this, and then remembered the class bell, and directly asked the two children to go to class first.

Then he looked at me with strange eyes, turned to the principal and said, "Is there still one class left, and the students are out of school!" ”

"You reminded me that I need to inform the teachers and students that they can't stay at school at noon."

The principal hurriedly went to the radio station, and after a while we heard his voice on the radio, Li He just asked, "Why did you just say those boring questions to those two children?" ”

I looked down and smiled and explained, "I just suspect they have something to do with this case." ”

"I've had doubts before, but I don't think it has anything to do with He Xiong's killing, because that man doesn't want people they can reach, will you make a fuss."

"Maybe, I'm just skeptical, don't be so excited."

"Do I have it? I don't, by the way, when I investigate the case later, I'm responsible for the quantity, and you are responsible for discerning! ”

The duration of a class was neither long nor short, and it passed quickly as the voice was spoken, and the principal made sure that nothing was left to chance, and he also checked each classroom one by one.

In the end, he took us to the laboratory, "We all came according to the requirements of the state, and after each class, we would make a record, and there was an obvious record in this notebook, you can take a look." ”

Every bottle and jar had a mark on it, and I asked Li He to check whether the name of each item was true.

Then I took these notebooks and calculated the number of grams I would use in each class, only to find that there was one red phosphorus that was much larger than half of the amount.

I showed the question to the principal, but he casually said, "This is very common, some students are curious, and when they do experiments, they will secretly take some of it, because there is not much danger, so we don't strictly investigate this matter." ”

"Besides, they are all middle school students, and during the rebellious period, no one will take the initiative to stand up and admit it, and we can only strengthen our precautions and make verbal criticism."

It is reasonable to listen to the principal say this, and the danger of red phosphorus is of course not felt by students who have just studied chemistry, but it is different for a chemistry teacher.

Because the police department has a special sample group, I have been graduating for many years, and I don't remember these very deeply, so I plan to go back and ask my colleagues with these questions.

Li He walked up to me and whispered, "Do you find anything else?" ”

I shook my head and replied, "I shouldn't be able to find anything for the time being." ”

Li He looked at the principal's smug appearance, and could only leave dejectedly.

While they were sitting on these things, one of them had already seen them all.

The first thing I did when I returned to the police station was to verify that idea, and even Li He couldn't interrupt me.

"No, Dr. Li, you will forget this, isn't this a necessary knowledge for you to study medicine?"

I smiled and didn't speak, and after she teased me, she still told me the correct answer.

"Red phosphorus is an item that can be seen everywhere in our lives, and a small amount is really not much harm, but a large amount is not necessarily, such as fireworks, and there is nothing to be done."

"Of course I know this, is there any other possibility?"

"Yes, there is, but in general, it is not possible, you have to be a researcher to find these, and you have to know chemistry very well."

That's the answer I want to hear, "Are you sure everything you say is true?" ”

"I promise, I can graduate from this major, and if I don't choose a job, I can still get a doctorate!"

I couldn't listen to her life, so I ran directly to Li He, pulled him and said all this, and then went to the leader.

As soon as we arrived at the door of the office, a colleague stopped the two of us and gave us one more piece of evidence to arrest He Xiong.