can not breath

Chapter 35 Being Instructed? (2)
The car stopped next to the trash can, Zhou Yuanyi opened the door, stood behind the old man, took out a pistol, and shouted: "Don't move! I'm a policeman!"
The old man trembled all over, and when he turned his head and saw the black muzzle of the gun in Zhou Yuanyi's hand, he was frightened out of his wits.He raised his hands high and asked in a trembling voice: "What are you doing? I didn't break the law..." A strong smell of alcohol came out of his mouth.

"What are you doing here?" Zhou Yuanyi asked loudly sternly.In fact, he was also afraid that the old man was not the murderer, but just a stranger who had nothing to do with the case and just happened to come here.

The old man said tremblingly, "I'm a waste picker. I happened to come here and found a trash can. This trash can was just put here, and it hasn't been there this morning. I was curious to see if there was anyone else in it." Throw it away, but something I can exchange for money."
Looking at the old man's appearance, it doesn't seem like he is lying.His legs were shaking all the time, and half of the wine in the bottle in his hand was dangling.

Zhou Yuanyi signaled the old man to stand aside, and then he stood beside the trash can.He leaned over his head and glanced into the trash can. There was nothing in it, only a pile of nearly rotten apples.
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However, the thick envelope was gone.That was an envelope containing 3 yuan in cash!
Zhou Yuanyi was startled, and quickly pointed a pistol at the old man with one hand, and carefully searched the old man's whole body with the other hand.But the old man had nothing on him, let alone the bulging envelope.

Zhou Yuanyi was extremely frustrated. He didn't know how the murderer took the envelope and 3 yuan.

Suddenly, he seemed to remember what the old man said - this trash can only appeared in this place this afternoon.One morning is enough time for the murderer to cast doubts!
Zhou Yuanyi turned around, raised his leg, and kicked the trash can hard, and the green trash can was immediately kicked away.Looking at the scene in front of him, Zhou Yuanyi couldn't help being taken aback.
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Where the trash can was originally placed, there was a big hole in the ground, and a big hole was cut out at the bottom of the trash can.In the hole in the ground, it was dark, and the gurgling sound of the water could still be heard.Below is a culvert, which is the pipeline for Jiangdu University to discharge domestic sewage.

Zhou Yuanyi understood that the murderer who asked for 3 yuan had arranged a cash collection plan in the morning.He dug a hole by the side of the dry bridge to connect directly to the culvert below, and placed the garbage can with a gap in the bottom here.The envelope containing the money was thrown into the trash can. He was in the culvert, so he could just build a ladder and reach out to take it away.

No wonder when Xu Tingting got off the car, the murderer didn't ask why there was a taxi parked nearby.Because he stayed in the culvert all the time, he couldn't see a yellow taxi on the dry bridge at all.

It has been half an hour since the envelope was dropped until the truth was discovered.Half an hour was enough for the murderer to leave leisurely through the culvert.

Xu Tingting sighed in frustration and said, "Too bad, the murderer slipped away right under our noses.

Suddenly, Zhou Yuanyi turned around, revealing a treacherous smile.He said to Xu Tingting: "Why did you admit to surrender so early? I think we should have a turning point."
Zhou Yuanyi took Xu Tingting and slowly drove the off-road vehicle into the campus of Jiangdu University.After a few phone calls, his colleagues also rushed to the campus.

According to Zhou Yuanyi's analysis, the culvert under the dry bridge beside the lover's beach has only two exits.An exit was under the dry bridge, but in fact, they didn't see anyone coming out of this exit, except for the drunk old man picking up rags.Then, needless to say, the murderer must have escaped through another exit—and the other exit was in the campus.

Zhou Yuanyi turned his head and asked Xu Tingting: "If you suddenly got the 3 yuan you dreamed of, what would you do first?"
Xu Tingting replied without thinking: "I will find a place where no one is around and open the envelope to see if the money inside is genuine."
"Not bad." Zhou Yuanyi nodded.Then he looked at his watch, and it was more than two hours since he handed over the 3 yuan.He said to one of his men: "It looks like he should have opened the envelope by now, it's time for us to act."
Xu Tingting asked in surprise: "Action? What kind of action do you have?"
Zhou Yuanyi smiled and said, "You will know after a while."
The school leaders of Jiangdu University also appeared in time at this time. Professor Li Hanliang, as the representative of the school, expressed that he would fully assist the police in their work.But obviously, when he saw his niece Xu Tingting was also present, he showed an indescribable expression.

Zhou Yuanyi wrote something on a piece of paper, and handed it to Li Hanliang, please ask someone to send it to the school radio station, and immediately repeat it on the campus speakers.

After a while, the trumpet hanging on the campus tree rang: "Attention, all students, if you see a person with blue splattered paint on the face or clothing on the campus, please call immediately and report to the school." Guard!"
The broadcast was broadcast over and over again on the campus through the loudspeaker. All the students showed surprise expressions after hearing it, and at the same time they immediately looked around, hoping to find the person described in the broadcast.

Only then did Zhou Yuanyi tell Xu Tingting that the envelope containing 3 yuan was handed to her by Xiao Gao from the technical department who made it as quickly as possible.Xiao Gao added a very small mechanism in the envelope, as long as the envelope is torn open, blue liquid will be sprayed out in a radius of one meter from the envelope.And this blue liquid can't be washed by water at all, and it won't fade within a few days.

What everyone has to do now is to find the person who was splashed with blue liquid!

"You are awesome! You really deserve to be Detective Zhou!" Xu Tingting couldn't help giving her thumbs up.And Zhou Yuanyi responded with a shy smile - he always looked so cramped in front of Xu Tingting.

The speed of information feedback is surprisingly fast.Some students reported that near the drug laboratory, they saw a boy in blue clothing running all the way, covering his face with his hands.And after that person rushed into the drug building, he never came out again.

When he heard the news, Li Hanliang's face was very ugly. The students who often stayed in the drug laboratory were all the graduate students he supervised without exception.Could it be that the murderer was really his student?In his mind, a face gradually emerged.Young, handsome, with a sunny smile - Xiao Zhijie!Could it really be him?
And this news undoubtedly confirmed Zhou Yuanyi's speculation. He always believed that the murderer of the series of cases was related to Jiangdu University, because only in this place can the mysterious substance A be obtained.Of course, the first thing he suspected was Xiao Zhijie.

Zhou Yuanyi led a team to the drug laboratory, which was a three-story red brick building covered with vines.There are several spacious classrooms on the first floor, and each classroom has several rows of desks with sinks, alcohol lamps, tripods, matches, test tubes, and jars on the desks. The classrooms are full of mystery without exception. The acidic liquid smell, which makes one can't help but feel a little eerie.

The second floor is the self-study room for postgraduates. The self-study room is not big, like a study.Li Hanliang has always praised students' self-study habits and encouraged students to learn spontaneously, so the self-study room is also designed to be very humane.Each study room is suitable for private drug research by a single student.

The third floor is the drug storage room, Li Hanliang's office and the rooms where the students on duty live.

When Zhou Yuanyi entered the medicine building, he stepped on the creaking wooden floor and smelled a faint smell of Lysol medicine.This smell reminded him of hospitals, whether it was Jiangdu University Affiliated Hospital or a psychiatric hospital in the suburbs, he had smelled this smell before, and this smell reminded him of this series of murders involuntarily.

In the experimental classroom on the first floor, several students, male and female, were earnestly doing experiments. They were all graduate students led by Li Hanliang.They said that since the afternoon, they have been staying here and have not left, and they can testify to each other.And when asked if they noticed anyone entering the laboratory building, they all shook their heads—they were all focused on doing experiments, they were too serious.

In the corridor up to the second floor, Zhou Yuanyi saw a discarded piece of clothing at the corner of the corridor. When he unfolded it, it was an original white shirt, but now there was obvious blue liquid splashed on the shirt.Yes, this sight was abandoned by the mysterious person who extorted 3 yuan.I looked at the brand of the shirt, and it was Youngor's, selling more than 300 pieces in the mall.

"What a pity," sighed a policeman regretfully.

"Stop talking nonsense, let's see if there is anyone on the second floor!" Zhou Yuanyi said.

The police officers knocked on all the study rooms on the second floor. There were not many students in the study rooms, only a few.The police also searched for the third floor by the way, and then gathered the students on the two floors in the corridor on the second floor.

Zhou Yuanyi took a closer look at the students he had found, and found that he knew only two of them.

One is Xiao Zhijie who just returned to campus from a psychiatric hospital.He was still deeply in the grief of losing his mother, and his eyes were red.And Shen Xiaoye was talking with him.They found them in the duty room on the third floor. Xiao Zhijie has been on duty in the drug building in his free time under the care of Li Hanliang.

The other one was the student named Long Hai, the student who accompanied Li Hanliang to escort Xiao Zhijie and his mother to the mental hospital that night.He is one of Li Hanliang's most proud disciples.

Zhou Yuanyi has always believed that the murderer is related to this series of cases, so it should not be someone he has never met.So when he saw these two people, his first instinct told him that the person who extorted 3 yuan was between these two people.Of course, such an idea is very arbitrary, it is just his intuition and lacks sufficient evidence, but Zhou Yuanyi still decided to start the investigation with these two people.

In his opinion, the Youngor shirt he found at the corner of the corridor cost more than 300 yuan to buy, which is not something a poor student like Xiao Zhijie can afford.So Zhou Yuanyi turned his suspicious eyes to Long Hai.

But what kind of connection does Long Hai have with this series of cases?This is really unimaginable, he is only Li Hanliang's graduate student, what reason does he have to kill so many people who are related to each other?
Could it be——was he instructed by someone?

Could it be that the person who ordered him was his mentor, Li Hanliang?

Thinking of this, Zhou Yuanyi couldn't help but shudder, he couldn't help thinking of Xu Tingting's big talking eyes.He really didn't want to suspect Li Hanliang.

Strangely, no blue liquid was found on Xiao Zhijie and Long Hai's bodies.Not only them, but from all the students, no trace of blue was found.

When Zhou Yuanyi took the envelope from a young master, Xiao Gao once said that this liquid was imported from abroad, and the FBI in the United States also used it as a special drug when paying ransom. It was absolutely unreasonable at this time expired.On Zhou Yuanyi's face, he couldn't help showing a disappointed expression.

The hale and hearty Li Hanliang suddenly walked up to Zhou Yuanyi and said, "Officer Zhou, have you encountered a problem?"
In Zhou Yuanyi's subconscious mind, Li Hanliang had already been regarded as a suspect related to the case.But at this almost desperate moment, seeing Li Hanliang's sincere expression, he couldn't help doubting his own judgment.

Li Hanliang smiled and said, "Officer Zhou, maybe I can help you."
"Oh?!" Hearing this, Zhou Yuanyi felt hot, "Professor Li, can you help me? That's really great."
Zhou Yuanyi told Li Hanliang about the problems he encountered.After Li Hanliang finished listening, he patrolled around the graduate students standing in the corridor, and then said to Zhou Yuanyi: "Officer Zhou, show me that shirt with the blue paint. Will you?"
Of course, his request was easily granted.

After Professor Li Hanliang got the shirt, he sniffed it by his nose first, then he cut a small piece of the shirt stained with paint with scissors, and put it into a jar.A little water was poured into the jar, and he took out a piece of test paper, dipped it in the water in the jar, and took a closer look under the light.

"Well, it's alkaline." Professor Li murmured.After speaking, he took another test tube and added a light brown liquid into the test tube.He poured the liquid into the jar.A magical imagination happened--the brown liquid quickly merged with the water in the jar, and in just a moment, the color of the piece of clothing that was dyed blue in the jar gradually faded, and finally all the blue turned out to be Disappeared.

Zhou Yuanyi stared dumbfounded, and asked in surprise, "What's going on?"
Li Hanliang smiled slightly and said: "Actually, it's all very simple. The blue pigment is alkaline. Soak it in an acidic liquid to neutralize the acid and alkali and make the color disappear. As you said, when you opened the envelope At that time, the blue liquid was sprayed one meter away from the surrounding area, so there is no reason why it should not be sprayed on the face of the letter opener. Now, there are no traces of blue on the faces of all the students, which means that the pigment It has been treated. And the only way to deal with it is to wash the face with a weak acid potion."
"Then..." Zhou Yuanyi asked hesitantly, "Then what should we do now?" At this moment, he no longer regarded Li Hanliang as the murderer's accomplice.If Li Hanliang has anything to do with this case, it is absolutely unreasonable for him to say how the murderer did not have traces of paint on the next year.

Li Hanliang took out a large stack of PH value test papers from the drawer, handed them to Zhou Yuanyi, and said, "It's not complicated at all. Since the acidic medicine has been used to wash the face, the murderer's face will definitely leave the residue of the medicine. Now just extract the Just drop the sweat on each of their faces on a PH value test paper and check the PH value. If anyone’s body fluids are acidic, then this person must have washed his face with an acidic potion—don’t forget, a person is normal Under normal circumstances, sweat should be alkaline."
Zhou Yuanyi raised his thumb and praised: "Professor Li, you are really amazing."
Xu Tingting, who was standing aside, said loudly: "Is there any need to say that? Otherwise, what would he do to my uncle?" After the two couldn't help but looked at each other, they smiled.

Zhou Yuanyi walked to the corridor and asked the graduate students to stand against the wall, then he took out the PH test strips in his arms, and said very politely: "One last thing to trouble everyone, now I want to collect everyone's sweat. It's very simple , just a few minutes, please cooperate."
As soon as he finished speaking, he heard a painful groan from a corner of the corridor.

It was Long Hai who made the sound!He looked at Zhou Yuanyi in despair, his body trembling uncontrollably, and there was a look of fear in his eyes.

A smug look flashed in Zhou Yuanyi's eyes.He understood that the one who had washed his face with acid potion was none other than Li Hanliang's favorite student - Long Hai!

He walked up to Long Hai and asked, "Are you going to tell us that we don't need to do the next work of extracting sweat?"
Long Hai nodded sadly.

"Yes, let the students go away. I admit that I am the one who texted Xie Yixue. I was the one who took away 3 yuan from the lover's beach dry bridge." Long Hai's voice became more and more serious. So small, he could barely hear himself.

"Well, very good." Zhou Yuanyi smiled, took out the handcuffs and handcuffed Long Hai, and then announced loudly: "Close the team.

(End of this chapter)