"I'm here for work, and for your problems, your dad and I have agreed not to interfere with each other. It needs to be stated that I have never been afraid of the master, he is a good person, but he is a little stricter, and he will get used to it after a long time. ”

"Why do you want to hear my opinion, is it because I am particularly thoughtful and have the ability to act?"

Zhang Chenzhi couldn't help laughing, and learned her sentence and said: "Is it that after staying in the United States for a long time, people are very good at boasting and being very confident?" Then I'll be direct, I just want to see if you have any new angles, let's discuss it. ”

"I don't know the situation right now, I can't analyze it. Is there anything new so far? Qiao Zhen was blunt.

Zhang Chenzhi stretched out his hands and said helplessly: "I asked first, but threw the question back to me." ”

Despite saying this, Zhang Chenzhi still talked about the latest progress and Qiao Zhen in detail and concisely. A colleague on a business trip in front obtained the transcript and medical records from the nail household, and the other party's statement further coincided with Chen's personality characteristics and the statements of the driver's wife and Chen's subordinates. In addition, the nail household is in the hospital for surgery within the range of the exact time of Chen's death. Medical records and surgeons have verified that his family is rushing to his hometown at the same time, and information from high-speed rail, transportation, and communications have confirmed that the other party did not have the time to commit the crime.

"Indeed, in my opinion, not only do they not have the time to commit the crime, but they also do not have the ability to commit the crime, and their motives are not strong enough."

"Oh, can you be more detailed?" Zhang Chenzhi guided.

"From our professional point of view, there are generally two kinds of traces at the crime scene, visible physical traces and invisible psychological traces. In the process of committing criminal acts, whether intentional or unintentional, criminals will use material traces at the scene as a carrier, directly or indirectly reflecting the criminal's personality, professional characteristics, knowledge and culture, and even the psychological state at the time of the crime. ”

"This state should be fluctuating and unpredictable."

"Yes, but at the same time, the traces of criminal psychology still have relative stability and particularity, that is to say, the style and way of doing things in a certain period of time have their own unique ways, and they will be relatively different from others, and they are not easy to confuse."

"Hearing you say that, it seems that there is already an answer."

"I don't have an answer, I'm just talking about my analysis. In my opinion, sometimes there are no traces on the scene, but there are many traces. It's like a blank space in a painting, an exclamation point in an article, silence is better than sound. At this scene, this truth is illustrated. ”

"It's kind of interesting, go on, it seems that you have a rough outline of the murderer in mind."

Qiao Zhen nodded: "First of all, this criminal is very familiar with the deceased's life and family environment. The door of the deceased's home is unlocked by fingerprints, and even if the deceased did not enter the door by himself, or did not enter the door through fingerprints, he must know the password of the door lock. According to the soft entry method, only people can enter the house, and we have long agreed on this. In addition, there were no extra fingerprints or traces left at the scene, indicating that his personality was cautious. ”

"Do you think that the nail household does not have such the ability to commit crimes, is not bold and careful enough, and does not have the conditions for such a soft entry."

"Yes, especially from a pre-investigation and forensic point of view, the deceased is most likely to die from complications caused by insulin overdose. At the moment, we can't find any other possibility, so we might as well work backwards to rule it out. Judging from this uncommon or even relatively rare way of committing crimes, this criminal is not less educated, or at least has relatively medical knowledge. ”

"In this way, several objects can be excluded, and nail households, nail households, drivers, and drivers' wives do not have such knowledge and cultural quality."

"And this criminal is meticulous in his work, and once he makes up his mind, he is more resolute. Even if it is the first time to commit a crime this time, it must have been carefully premeditated rather than a crime of passion. Moreover, it must be said that choosing such a way to die for Chen is more dignified in terms of the degree of pain at the time and the appearance after death. If we make a bold guess, it can be said that he is a person who both loves and hates him. ”

"In this way, the answer is already clear."

Qiao Zhen frowned and thought: "I don't think so, the question now is, who can have the above comprehensive conditions, the chain of evidence cannot be broken, and the most important thing is, who can be exposed to a large amount of insulin?" After all, this drug is prescription and not readily available. Of all the possible people we interviewed in the early stage, there was no such object. ”

Zhang Chenzhi tapped the notebook with a pen, thought about it for a while, and shook his head firmly: "It's true." ”

Qiao Zhen hugged the thermos cup in a daze, and suddenly frowned, and his eyes lit up towards Zhang Chenzhi.

Zhang Chenzhi just smiled: "Let's talk about it." ”

"Insulin is obtained, either through the normal way of the hospital, or privately from a private clinic or from a nurse on duty. Familiarity with the way insulin kills, if you are not a doctor, a nurse, or a former nurse, a drug salesperson, or someone very close to you in a similar profession. I suddenly recall that in the deceased's home, there were several spice bottles with rubber tape on the labels, which was the kind of tape used for intravenous drips in hospitals. ”

"You didn't say anything about such an important discovery earlier?"

"The deceased's home has more than ten rooms, with an area of more than 1,000 square meters, and if I didn't observe carefully, who could have found the texture of the label on this small bottle. In terms of appearance, it is actually not much different from the general label, and if it weren't for the undulation of the handwriting of the ballpoint pen on the cotton material, I probably wouldn't remember that it was tape. ”

"A few elements like this alone are not enough to prove anything."

Qiao Zhen waved his hand confidently: "In addition, in one of the drawers in the bathroom, I found medicinal gauze, and in the garden toolbox, I also found medical gloves, which are the kind of gloves that doctors use when performing surgery." It's hard to have three things in the home of a non-medical worker at the same time. At the time, I wondered if the hostess had a habit of cleanliness. ”

"This is a very important discovery, what do you think?"

"In my opinion, we didn't emotionally list our fiancée as a key target in the early stage, because she was impeccable in terms of the motive for the crime and the relationship with the deceased. Moreover, in terms of preliminary investigation, her background was not in any way related to medicine. ”

"But now as our investigation deepens, the situation has changed."

"Yes, the deceased cheated before the marriage, although he did everything well and blocked the news, but it is very likely that the sensitive and meticulous hostess found the clues."

"We should now dig into her background and social connections, but I am afraid that we have missed the best time, and I will send someone to monitor her 24 hours a day."

"If it was planned in advance, then according to the murderer's careful thinking, from the time we appeared at the scene to investigate, it has been more than 20 hours, it is very likely that she was ready to leave before the move, or may have left."

Zhang Chenzhi immediately dialed a phone call: "Lao Li, you now immediately use the dog with the highest authority (referring to the key) to check whether the deceased's fiancée has bought air tickets and train tickets in the past 30 days, and tell me immediately if there is news." ”

In less than two minutes, Zhang Chenzhi's phone rang, and his face was suddenly ugly. Qiao really understands that the plan for the surveillance operation has been canceled, and the arrest operation has begun now.

Police cars roared towards Pudong International Airport, and another group of people set off from the parents of the deceased's fiancée almost simultaneously and headed towards the airport, preparing to outflank the fugitive murderer.

The third group of police went straight to the home of another suspect, Wang Li. Wang Li was about to go out at the moment when the police rushed into the house, he was so frightened by the sudden loud noise that he trembled all over, and the duffel bag fell to the ground, he looked at the police in uniform, stayed in place, and listened to the other party in a trance to inform him of his rights and obligations, as if he didn't understand what was happening, and seemed to have forgotten where he was going and what he had done.

Zhang Chenzhi, who led the team, exchanged a color with the team members and signaled to take it back to the bureau. In his experience, such suspects are not difficult to triage. Being bold in everything and being timid after an accident is really a fatal weakness.

At the moment when he was stopped at the airport, Chen Xiang didn't seem to be surprised, on the contrary, he asked with confidence: "Do you have any evidence?" ”

"What a calm and calm woman, such a woman will be emotionally stumped, sad and lamentable." Qiao Zhen sent a WeChat message to Shi Yan in the car.

"That's not to the heart of the Yellow River." Shi Yan still hit the nail on the head.

"Yes, it is estimated that when I see Wang Li, I will understand that I can't pass this hurdle. In the face of life and death, this cowardly man can care about love, and he has already recruited everything. ”

Sure enough, the moment she showed her the video of Wang Li's interrogation, Qiao Zhen felt that she was really old in an instant. is born from the heart, perhaps it is the life she thought had no hope that will make her look really old in advance.

In the interrogation room, she no longer had the trace of panic when she was at the airport, and after taking care of not wanting to see her parents, she sighed deeply, with only relief on her face, and explained everything very cooperatively.

The deceased's fiancée, Chen Xiang, as Qiao Zhen expected, was 39 years old this year, about 17 years old, attended a nursing college, worked as a nurse for less than a year after graduation, and then worked in a pharmaceutical sales company for three years until she got married for the first time.

After a brief marriage that lasted less than two years, she returned to the workforce and worked in administration for about a decade, during which time Chen Xiang had a staunch admirer who pursued her, Wang Li, a former colleague at a pharmaceutical sales company. This man did not marry or marry for her, and the two once maintained a relationship of unfulfilled lovers. This relationship lasted until Chen Xiang was once again involved in a relationship, that is, after Chen Xiang became acquainted with the deceased Chen in the workplace. Even after she resigned and lived with Chen, she and Wang Li were still close friends who talked about everything.