Surroundings of any crime scene are more important.
Especially for this kind of flat site, the warehouse has only one floor and only one entrance and exit, so the suspect will definitely enter and exit through the main entrance after handling the body, and it is very likely that some traces will be left.
This is also the main reason why Lu Chuan asked two on-site investigation criminal police to conduct on-site investigation and photography from far to near before entering the scene.
According to some common experience in criminal psychology, if a suspect uses certain tools at the scene, it is very likely that the tool will be discarded near after leaving the scene.
The suspect has the mentality of putting things related to the corpse together when dealing with the corpse.
Unless the murder weapon or related items were brought from the suspect from home, they will not be brought back under normal circumstances.
This is true for many cases handled by Lu Chuan, Yang Lin, Yang Sen and others. The probability of finding murder weapons near the corpse or items related to the crime scene is relatively high.
Yang Sen just started from the main entrance, circled the entire warehouse clockwise, and carefully observed and looked for some situations around the warehouse.
The entire warehouse is not large, only more than 300 square meters, with some buildings around it, but the distance is more than 50 meters. This warehouse is close to a courtyard wall in the park.
"The suspect should have escaped by climbing over the wall. There are signs of climbing in the place where the warehouse and the backyard wall of the park are connected. I have taken photos."
Yang Sen’s discovery is still relatively important. It basically determines the path for the suspect to enter and exit the entire park. In addition, it also discovered that the gloves worn during the crime that were most likely left by the suspect.
Lu Chuan put down his work and asked Yang Lin to continue to conduct surface investigations. He and Yang Sen went outside to look around. Sure enough, there were obvious climbing marks in the right rear side of the factory warehouse, and there were also several bricks. The height of the courtyard wall was about 1.7 meters. After putting these bricks, you can climb over more easily.
"Ship Wang, come here."
Lu Chuan called Wang Shuai over and pointed to the place where the suspect entered and left the park.
"There are signs of climbing here. Let's go outside to see if there are any surveillance nearby to see if there are any clues."
"Yes, I'll go there now."
"Old Yang, carefully investigate this area to see if you can find footprints. After taking photos, we will do analysis and research."
"Okay."
The investigation on the site lasted about three hours, and the forensic doctor was allowed to enter the site.
In addition to Yang Sen's discovery, Lu Chuan and Yang Lin also collected some fingerprints and footprints in the warehouse, and needed to go back and analyze these clues. In addition, some skin debris and hair were found on the ground.
Although it is not certain whether there are criminal suspects in these biological clues and information, they all need to be analyzed before they can be finalized.
At the scene of the crime, Lu Chuan called Zhang Hui, Wang Shuai and others together and held a brief meeting.
"The deceased's death was around 10 o'clock last night. This period of time requires a detailed investigation of the surveillance in the park.
Zhang Hui, please follow up on this clue. In addition, you must determine the identity of the deceased as soon as possible and search for the recently missing persons. ""yes! ”
Lu Chuan looked at Wang Shuai again: "Zhang Hui is responsible for investigating the situation and surveillance in the hospital. Wang Shuai, you are responsible for investigating the surveillance outside the hospital, especially the surveillance of the suspect entering and leaving the nearby ones, to see if there are any clues, and to find some clues."
"Okay, I'm already moving forward, and there are no clues yet. I will investigate the surrounding surveillance one by one, and the traffic police will also contact you."
An hour ago, when Yang Lin discovered that the suspect had left the park or entered the park's passage, Lu Chuan had arranged for Wang Shuai to conduct an inspection, but at present, there were no major discoveries.
"The other groups should conduct appraisals in accordance with their work responsibilities, and conduct appraisals for on-site investigation and appraisals, and visit those who should visit. The forensic doctors should provide relevant appraisal reports as soon as possible. We will hold the first formal case analysis meeting tomorrow morning."
Lu Chuan is very familiar with the work process of the Criminal Investigation Detachment, and after serving as deputy director in the High-tech Zone, the work arranged and deployed was relatively more, and there was no shortage of management experience, so the arrangement was organized.
During the period when Lu Chuan was away, Yang Lin and Yang Sen's technology grew very fast, especially the trace evidence analysis laboratory he formed. Now the two of them are fully competent.
The relevant fingerprint identification and analysis were carried out by two new on-site investigation detectives, while other trace evidence analysis was carried out by Yang Lin and Yang Sen. As for the collected footprint identification and analysis, Lu Chuan personally did it.
Footprint identification and analysis are quite difficult. Although Yang Sen and Yang Lin also tried to do some learning, the effect is not particularly great.
Lu Chuan never forced this point because he had systematic skills, so the skills he got were at the maximum level, but it really requires a little thought to teach others, and the most important thing is to accumulate experience.
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Only after seeing more, learning more, and seeing more, after several years or even more than ten, twenty or thirty years of accumulation, can we gradually form a set of professional skills that suit our habits.
The on-site investigation and collection of the crime scene is all based on the maximum scope, which means that as long as the information that can be collected must be brought back.
Of course, the synchronization also requires the time efficiency of inspection and analysis, so some traces on the site must be distinguished during on-site inspection.
Yang Sen also found some clues outside the warehouse, and collected some fingerprint information on the wall, especially three sets of fingerprints near the suspect discarded his gloves.
Of course, this glove is just assumed to be discarded by the suspect, because it is very likely not, so this is not certain.
In addition, fingerprints were collected at the low wall where the suspect left the park.
Yang Sen also found half of the footprint on the wall and handed it over to Lu Chuan for identification and analysis.
The report received in the morning was already 3:00 pm when the body was pulled back for an autopsy. Lu Chuan and the others began to advance their work, and they were not idle for a moment. When it was dark, there was a major breakthrough in the investigation of the case.
When Zhang Hui and his group finally compared a person who reported missing the day before yesterday when checking the identity of the deceased.
After confirming the identity of the deceased, Zhang Hui called Lu Chuan immediately.
"Lu Zhi, the identity of the deceased has been confirmed. He is a senior student in the Dance Department of Haizhou Arts College. He is named Zhang Min. He is about to graduate and is undergoing an internship this semester." (End of this chapter)