Chapter 1056 Investigation
"How did the victim Sun Xiuwen's stepfather rule out the suspicion?" Jiang Yuan waved to forensic doctor Tang Feng to sit down.
The case was just beginning to be understood. After another half month, Jiang Yuan didn't seem to be in a hurry and asked slowly.
Cao Chujun moved his body, faced Jiang Yuan, and said, "The main issue is the time of the crime. The victim's mother testified that her husband was with her from 6 to 8 in the morning."
"Do husband and wife testify against each other?" Wang Chuanxing asked when Jiang Yuan didn't speak immediately. In this kind of small-scale discussion, even a rookie police officer can usually intervene, and occasionally say something outrageous without being criticized.
Cao Chujun smiled and said: "Although they are a couple, it is the victim's mother who testified, and there is some evidence."
"What evidence?" Wang Chuanxing asked.
"Condom." Cao Chujun answered, and said more clearly, "At around 6 o'clock that day, the two had sex, and the condom was thrown into the trash can. Evidence has been collected."
Wang Chuanxing was surprised: "Two hours?"
Cao Chujun looked at Wang Chuanxing strangely and said helplessly: "We were both awake before and after. The two of them had a conversation after last night. During the time of the victim's death, the victim's stepfather should not have had time to commit the crime."
"The time of death needs to be considered." Jiang Yuan suddenly said this, interrupting the communication between the two.
Cao Chujun was stunned, turned around and sat down.
Jiang Yuan's accuracy in judging the time of death has long been a legend in the field of domestic investigation. At that time, a photo showed the omissions of experts in the capital on the missing gun case, and then solved the backlog of cases that had not been solved for many years. It was amazing. Since then, there have been very few people who dare to question Jiang Yuan about the time of death.
Tang Feng, Changyang City's own forensic doctor, also hurriedly looked through the information, not daring to say a word of questioning.
Jiang Yuan himself said: "Before the case occurred, it was raining locally, which means that the temperature has dropped. When the temperature drops, the relationship between the body temperature and the time of death must be reconsidered. This is one of them."
Jiang Yuan looked at Tang Feng, and then said: "The problem of rigor mortis is the same. I won't go into details here, but looking at the body surface characteristics of the corpse, the victim died earlier than expected. The most important thing is …”
Jiang Yuan took the remote control, put a few pictures on the PPT, and said: "The state of these insects can better explain the local temperature state, especially these nymphs... I judge that the victim's death time should be It was between 3 a.m. and 4 a.m. that day.”
This is equivalent to pushing the time forward by three hours, and the previous investigation may have to be overturned and restarted.
Tang Feng said hurriedly: "Captain Jiang, I'm not questioning it, but when it comes to measuring liver temperature, it feels like it's not easy to make mistakes."
"You measured the liver temperature too few times, and it was a little late. In addition, the area where the body is located is just under the cliff, and the temperature is much lower than the normal road temperature..." Jiang Yuan explained why. The reason for the error.
Tang Feng quickly understood: "There are some inadequacies in the plan we used... So what do you think is the best way to judge the time of death?"
He still wants to learn.
Jiang Yuandao: "At the moment, it's insects. Although the first scene is not here, the deceased's body was left in the wild for a long time. There are many types of necrophilic insects. Using forensic entomology, the judgment will be more accurate."
Tang Feng smiled bitterly. Although forensic entomology is simpler than forensic botany, in terms of pure difficulty, it is not as good as forensic anthropology. However, this kind of thing is still an obvious out-of-class topic. The average forensic scientist can learn a little bit, but basically not. More in-depth understanding.
In short, as far as the forensic doctors here in Shannan Province are concerned, most of the forensic doctors in prefectures and cities do not even have LV1 forensic entomology technology. Changyang City is no exception. On the contrary, there are several forensic doctors in some obscure cities and counties who may be bored with their free time or have some opportunity to learn some forensic entomology on their own.
Cao Chujun didn't have time to deal with Tang Feng's emotions and said directly: "In this case, the time of death will be between 3 and 4 in the morning that day! In this way, the victim's stepfather returns to the list of suspects!"
Jiang Yuan held a new PAD, flipped through some photos, and nodded: "It can be corrected this way."
If it was a pure case, he could look at the body and study it. The current case half a month ago no longer had this condition, and the judgment could only be made by looking at the photos, so it was more difficult.
Tang Feng naturally didn't say anything. Although he was also a forensic doctor from the Changyang City Bureau, and sometimes provided support to local city and county forensic doctors, compared with a national boss like Jiang Yuan, he could only adhere to the principle of "I am a primary school student". attitude.
Cao Chujun stood up: "In this case, I will immediately send someone to bring the victim's stepfather over. In addition, I will organize people to re-investigate the victim's home. If the stepfather committed the crime, the first scene is still very likely to be at his own home. However, the first time There were no obvious traces or findings during the survey..."
As he spoke, he looked at Jiang Yuan.
Jiang Yuan smiled and said proactively: "Then I'll go to the victim's house and take a look. I'll also take a look at the place where the body was dumped."
"Okay! Great!" Cao Chujun quickly responded.
On-site investigation is the same as forensic examination. The first time there is no result, the second time it is more difficult to get results. Especially now that more than ten days have passed, Cao Chujun is not very confident in finding some evidence if the suspect does further cleaning at his home.
One more thing, Jiang Yuan took people to the car and set off for Hualing Township. The Criminal Science Center of Changyang Municipal Bureau also sent two cars to accompany them. Together with the two cars of the Criminal Police Detachment, the entire convoy drove out a total of ten cars.
Looking at the mighty team leaving the yard of the Criminal Police Detachment, Yu Wenshu stood in front of the window of the office, and a sentence suddenly came to his mind: I have never fought such a rich battle.
Looking at this situation, Yu Wenshu felt that if he needed to arrest someone in the future, he would not need his own Criminal Police Detachment to send people.
Seeing the convoy moving away, Yu Wenshu couldn't help chanting a poem: "... Three years of being a guest in the rivers and seas, a hundred battlefields in the world. Who can refuse to be drunk and drown in the Qingzhang."
This is "Night Drinking" by Li Shangyin, his favorite poet. The reason why he liked Li Shangyin was not for anything else at first, but because Li Shangyin's poems were complicated enough that others could not memorize them, but he could easily remember them at a glance.
Yu Wenshu recalled Jiang Yuan's performance in the conference room just now, and couldn't help thinking in his heart: This boy is like me!
…
Hualing Township.
Sun Xiuwen’s home is a two-story self-built house. The door of the large courtyard is directly next to the township road. When you open the courtyard door, you will see the road. However, there are few pedestrians and vehicles on the road, so it feels quite quiet.
The whole village is sparsely built, basically in a long strip. Some houses are built more densely, which are mostly the houses of several brothers, or several brothers in the previous generation.
The village has long been connected to water, electricity and the Internet. It is also a township under the provincial capital. It only takes 20 minutes to ride a motorcycle to the nearest town, and less than 10 minutes to the nearest market. There is no inconvenience in life, but as for the village itself, it still feels remote and desolate. Especially when a large number of farmlands are abandoned, the places a little farther away from the village are covered with half-human-high weeds.
Sun Xiuwen’s body dumping site is right on the roadside. To some extent, it is a bit careless. If the murderer is willing to walk a dozen meters further in, it is likely that he will have to rely on smell and luck when he is discovered.
But from another perspective, this is also a smart approach. The body was dumped a few meters away from the roadside, leaving few traces. It was raining, so the trace examiners got almost no useful information.
At Sun Xiuwen's house, Jiang Yuan, who was trying to find the first scene, never found it.
In the two-story house, Sun Xiuwen lived in a room on the east side. The interior furnishings were also very simple, just a bed, a table, a bookcase, a wardrobe, etc. If there were any special things, they were just some girls' dolls.
At this time, even these dolls were turned out, and they were checked one by one to see if there were any traces of suffocating the victim.
"Have you cleaned or replaced the bedding and pillows in this room?" Jiang Yuan called the victim's mother over to ask.
The victim's mother was only in her 30s. She cried and shook her head vigorously: "No. After Wenwen left, I didn't move anything in the room. The room has been locked these days."
"What about your husband? Has he changed or thrown anything away?"
"No, I don't allow him to move."
Jiang Yuan couldn't ask any more questions here, so he had to let the victim's mother leave and paced around the room again.
He had also looked at the other rooms in the house, and also found no traces of murder.
Assuming that the stepfather is the suspect, the probability that the room is the first scene should be very high. Because sexual assaults between acquaintances often occur in places familiar to one or both parties, murders that occur at 3 a.m., even if the crime was committed earlier, both parties should have gone to bed...
Jiang Yuan was unwilling to sweep the room again. At this time, he saw a few crumpled jeans in the closet.
Picking it up, Jiang Yuan couldn't help frowning.
Sun Xiuwen's room was fairly tidy, but these jeans were not folded or hung up, and there were still some stains on them that hadn't been washed.
Jiang Yuan thought about it, turned around, opened the window, and looked down again.
The stains on the wall were indeed similar.
"Rapunzel!" Jiang Yuan waved and called the two people over, asking them to take a photo.