Profiler 2: Criminal Investigation Brigade

Jiao Du smiled and said: "No problem, we not only have channel information, but also informant information!"

"That's great!" Jiao Yang said with a sigh of relief: "Thank you, brother, I'll treat you to dinner another day!"

At this moment, Zhou Ying hurried over and said, "Captain Jiao, there's something new! Someone came to our bureau to report clues to the carbon monoxide poisoning case!"

Jiao Yang put away the phone casually and said, "Who is it?"

Zhou Ying said: "It's also from Shencheng Ocean University, a lady named Yang Qing!"

"Yang Qing?"

Jiao Yang said: "Isn't this just the teaching assistant in the chemistry department? It's very lively this time, let's go, let's go and have a look together!"

Jiao Yang soon met Yang Qing, a handsome woman in her early thirties, not very beautiful, but with a quiet and bookish air.

Jiao Yang stepped forward and said, "Hello, Ms. Yang, I'm Jiao Yang, the captain of the Serious Crime Brigade. Do you have any clues to provide?"

Yang Qing licked her lips and said: "I read the news recently and learned that the case of Professor Fan's wife was related to carbon monoxide poisoning. At the end of last month, after work, I went to the laboratory to tidy up, and accidentally saw Professor He Tang there. Carbon monoxide gas is being injected into the balloon. I don’t know if it’s related to this case, so I’ll come here to provide some information.”

"Ms. Yang." Jiao Yang said seriously, "Do you know what you are talking about? You are now accusing Professor He Tang of murdering Professor Fan Yiwen's wife Xu Zhenzhen."

"No, I..." Yang Qing said in embarrassment, "I'm just telling what I saw, and I didn't intend to accuse Professor He of killing..."

Jiao Yang said: "Ms. Yang, the case is still in the investigation stage. We, the police, have not disclosed the details of the case. He Tang is a professor in the Department of Chemistry. He often conducts experiments on carbon monoxide. May I ask how you judged the case? , Xu Zhenzhen died of carbon monoxide poisoning, is it related to Professor He?"

"I..." Yang Qing bit her lip and said, "Because it is a case related to our school teacher, I have read a lot of reports and analyzes of this kind. Some media said that Professor Fan's wife was poisoned and killed. Yes. So I'm here to provide information."

Jiao Yang said: "Then it still means that you think that Professor He has something to do with Xu Zhenzhen's death. How did you judge this? Is it also analyzed by the media?"

"No..." Yang Qing said embarrassingly: "I am a teaching assistant in the Department of Chemistry. In fact, I have seen it before. Xu Zhenzhen came to our school, but not to find Professor Fan. Rather, she left with Professor He... In short, Captain Jiao, I'm just doing my duty as a legal citizen."

"Okay, thanks for the information."

Jiao Yang said: "But I still have to make a routine inquiry. Our police force has reviewed the experimental videos related to carbon monoxide in the Department of Chemistry of your school within a month, and did not find that Professor He injected a large amount of carbon monoxide into the balloon. May I ask how you did it?" have witnessed?"

Yang Qing took a deep breath, raised her head and said, "I remember it was the end of May, and the school had a power outage that day, so there was no video surveillance."

"You are very careful."

Jiao Yang glanced at Zhou Ying, motioned her to check the power outage information in the city last month, and then asked, "Ms. Yang, can you describe the situation at that time?"

Yang Qing pondered and said: "As soon as I opened the door and entered the laboratory, I saw a reagent bottle with a dangerous reagent symbol on it in front of Professor He. Out of professional habits, I took a closer look and saw that in the reagent bottle was Carbon monoxide. Professor He is pouring the gas in the reagent bottle into a relatively large balloon."

Jiao Yang asked: "So, apart from you and Professor He, was there a third person present?"

Yang Qing said, "No."

Jiao Yang said: "That is to say, no one can prove your statement, can it?"

Yang Qing hesitated for a moment and said, "Yes."

Jiao Yang nodded and said: "Okay, thank you for providing the information. But, Ms. Yang, I remind you that perjury is an offense and a criminal offense. I hope that what you said is true and effective."

Yang Qing was startled, "Yes, what I said is true!"

After sending Yang Qing away, Jiao Yang sorted out and summarized the case, and held a discussion meeting again.

Lu Yuanli said: "I think what this female witness said is false. As far as I know, the reagent bottles in the laboratory include reaction bottles, round bottom flasks, flat bottom flasks, Shrek bottles, microwave reaction tubes, etc. Wait, the volume varies from big to small. The commonly used ones are 25, 50, 100, 250, and 500 milliliters, which are selected according to the experiment. This amount is not enough to fill the big balloon. It is what Jiao Yang said before, through black market channels Obtaining a large amount of carbon monoxide gas is more in line with the status quo."

Jiao Yang said: "I think so too. There is another problem. We checked the time of the power outage, and it was indeed on the 29th of last month. However, it was nearly 20 days before the crime occurred. I don't know if you have noticed it. No, the balloon will have a natural leakage process. Generally, the balloon will deflate in two or three days. After such a long time, a balloon has already been emptied and can no longer be used as a murder weapon. But last week, where was the BMW car? The Tang family stays closer."

Hou Xiyong said: "Then Yang Qing came out to testify against Fan Yiwen in order to whitewash Fan Yiwen. It seems that the two of them really have an affair!"

The next day, the review of Fan Yiwen and He Tang was finally approved.Jiao Yang and Zhang Xianning split into two groups and went to their homes to search.

Jiao Yang led the team to He Tang's house, and the person who opened the door was a well-maintained middle-aged woman with a good temperament.

Jiao Yang showed his ID and searched and approved: "Jiao Yang, Shencheng Criminal Investigation Serious Case Brigade. Are you Ms. Li Wenyi? Your husband, Professor He Tang, is suspected of poisoning and killing the two deceased Xu Zhenzhen and Lin. This is The search is approved, and we want to take a look at your home."

Li Wenyi was stunned, "What, you said Lao He killed people? No way, he...why did he kill Xu Zhenzhen?"

"I'm sorry." Jiao Yang said: "The case is still in the stage of investigation and evidence collection. It is inconvenient for us to disclose too much. Please cooperate."

Li Wenyi smiled wryly: "In this situation, can I still not cooperate? You can search whatever you want!"

Professor He Tang's house is not small.Very neat 4 bedrooms and 2 living rooms, decorated in a simple European style, warm and comfortable, and decorated with a cultural atmosphere.There is a row of large bookshelves in the living room, and in the ancient shelf opposite, the most conspicuous place is a set of experimental equipment including glass catheters, beakers, and flasks.

Pointing to the set of glass equipment, Jiao Yang asked Li Wenyi, "Professor Li, is this your husband's experimental equipment?"

"Yes." Li Wenyi replied: "But this set of equipment is almost brand new. It's just a decoration here, and he hasn't used it much."

As if to prove what she said, Li Wenyi looked at the thin layer of dust evenly falling on it.

Because it was all glass equipment, after taking photos carefully, Jiao Yang signaled Yu Xiaoguang and Zhou Ying to carefully move the equipment down together.

The whole house was searched and nothing else was found.Jiao Yang suddenly said: "We still have a basement, right? Where is it? Could you please show us?"

The expression on Li Wenyi's face froze, and he quickly said calmly: "Okay, I don't go down often, just wait a moment, I'll look for the key."

Several people followed Li Wenyi to the B2 floor. As soon as they opened the door to the basement, they smelled a sour smell of chemicals.

Jiao Yang and Zhou Ying looked at each other, and said with a smile, "Does Professor He usually do experiments here?"

Li Wenyi replied slowly: "Not really, just put some sundries, we rarely come down."

"what is this?!"

Hou Xiyong went up and lifted up the entire blackout cloth.Below, there is also a complete set of experimental equipment.

Jiao Yang said: "Is this also Professor He's?"

"Yes." Li Wenyi said: "But Lao He is busy with work, so he seldom plays with these at home."

Jiao Yang looked at Li Wenyi and said, "Then we'll take it away first."

Li Wenyi said indifferently: "Whatever."

Zhang Xianning found nothing at Fan Yiwen's house, but Jiao Yang found two sets of laboratory equipment and some chemicals at He Tang's house. Next to the equipment in the basement were oxalic acid, sodium oxalate, and other chemicals that can produce carbon monoxide.

Jiao Yang asked these evidences to be brought back, and immediately interrogated He Tangdao: "Professor He, Yang Qing, a teaching assistant in your school's Department of Chemistry, testified that at the end of last month, that is, on May 5th, you were in Laboratory No. 29 of the Department of Chemistry. A large amount of carbon monoxide gas was injected into the balloon, is there such a thing?"

"No!" He Tang said angrily: "She just framed me with nonsense to get rid of Lao Fan! It was my wife's birthday that day, and I went home early in the morning, and didn't go to any laboratory at all!"

Jiao Yang said: "However, we just found a large number of test tubes and other laboratory equipment and medicines such as oxalic acid and sodium oxalate in your home. Did you prepare carbon monoxide at home for poisoning Xu Zhenzhen? used?"

He Tang said angrily, "I didn't kill anyone! I'm a chemistry professor, and I have some research equipment at home. What's so strange about medicines? Captain Jiao, let me tell you, oxalic acid is not a controlled drug. I haven't committed a crime!"

Jiao Yang took out a dozen photos, put them in front of him, and said, "Then why do you keep two sets of experimental equipment separate, one is empty, the other has traces of use, one is in the living room, and the other is in the living room?" What about in the basement?"

"What are you talking about, two sets of equipment? Another set is in the basement?!"

With trembling hands in handcuffs, He Tang picked up the photos and looked at them. Suddenly his whole body trembled, and he said in a trembling voice, "I, I... I pleaded guilty! It was indeed I who killed Xu Zhenzhen! Everything is fine. Who knows that a few months ago, she accidentally found out that Lao Fan was getting involved with that student of his, that is Yang Qing!"