Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

"Furthermore, the suspect's characteristics: Judging from the footprints, the suspect is approximately 175-180 cm tall, of medium build, and wearing size 43 diamond-patterned rubber-soled shoes; judging from the distribution of traces at the scene, the suspect may have climbed into the room through the left-side window on the south side, or entered directly through the unlocked door, and fled along the dirt road on the north side after committing the crime. During the escape, there were bloodstains on his hands or clothing, leaving related traces; the metal buttons and cigarette butts that were retrieved may have been left by the suspect, and further examination can help identify the suspect."

"Time of death and nature of the case: Based on the degree of blood drying at the scene, the condition of the body (avoiding forensic details), and villagers' reports, the preliminary judgment is that the time of death was approximately three days ago. The exact time of death needs to be determined by subsequent forensic examination. There are obvious signs of a crime at the scene, including sharp instrument marks, suspect footprints, and bloodstain distribution. There are no signs of suicide, and the case is preliminarily determined to be a case of intentional homicide. Suspicious clues: No clues have been found to confirm the identity of the deceased. The deceased had no identification documents or personal belongings, making it impossible to preliminarily determine their identity. Clues such as the suspect's footprints, metal residue, buttons, and cigarette butts need to be tested in the laboratory to further clarify the suspect's characteristics and identity. The farmhouse has been vacant for a long time, and the suspect may have chosen this location to commit the crime because they were familiar with the environment or randomly selected the crime scene. The villagers reported seeing a blurry figure three nights ago; the height and build match the suspect's preliminary characteristics and need further verification."

"V. Recommendations for Further Investigation and Testing. 1. Immediately send all traces and physical evidence collected to the laboratory for DNA testing, metal material testing, fiber testing, footprint comparison, etc., to clarify the source of bloodstains, metal material, knife type, and the ownership of cigarette butts and buttons, and extract the suspect's DNA information if available. 2. Further organize the on-site investigation records, photos, and videos, mark the location and relationship of all traces and physical evidence, draw a site investigation plan and a trace and physical evidence distribution map, and improve the investigation data. 3. Expand the scope of the peripheral investigation, and further investigate the area extending from the dirt road to the north, the area around the abandoned well house, the open space to the south, and the surrounding farmland to look for the murder weapon (knife), other items left by the suspect, and more traces and physical evidence related to the case. 4. Based on the clues from the on-site investigation, cooperate with the investigation team to conduct further on-site interviews, focusing on verifying the blurry figure seen by villagers three nights ago, understanding the recent activities of unfamiliar people in the surrounding area, and screening suspicious persons."

After Yang Lin finished his report, he handed Lu Chuan the on-site investigation report, the list of trace evidence collected, and a preview of the on-site photos, adding, "Team Leader Lu, this is the preliminary report of the on-site investigation. All trace evidence has been properly packaged and is ready to be sent to the laboratory. The investigation data will be further refined later. At present, the core issue is that no clues have been found to identify the deceased, and the clues to the suspects are also quite scattered. We need to rely on subsequent test results and on-site interviews to further narrow down the scope of the investigation."

Lu Chuan took the documents and carefully reviewed them, his brows furrowing slightly. He nodded as he read, and after finishing, he looked up and said in a calm tone, "Very good, Yang Lin, Yang Sen, your technical team did a very meticulous job, following all procedures. The trace evidence you collected was also quite comprehensive, laying a solid foundation for solving the case." Afterward, Lu Chuan convened an impromptu meeting with members of the investigation and technical teams to plan the next steps.

"First, the technical team immediately sent all trace evidence to the laboratory, coordinated with the testing personnel, and expedited the testing work, giving priority to testing blood DNA, the suspect's footprint characteristics, metal residue materials, and cigarette butt DNA. We must produce the test results as soon as possible to support the case investigation. At the same time, we further organized the on-site investigation data and drew up a complete on-site plan and trace evidence distribution map to ensure that every piece of data is standardized and accurate."

"Second, the investigation team was divided into two groups. One group continued to conduct on-site interviews and expanded the scope of the interviews. They not only interviewed villagers in the surrounding area, but also investigated villagers in Lucao Gou Village and surrounding villages to find out if any strangers had entered or left recently, or if there were any unusual circumstances. The focus was on verifying the blurry figure seen by villagers three nights ago and collecting more suspicious clues. The other group was responsible for investigating the past use of the vacant farmhouse, understanding the social relationships of Li Feng and his family, investigating whether there was any motive for the crime such as revenge or disputes, and also investigating the use of vacant farmhouses in the surrounding area for any other relevant clues."

"Third, we will assign team members to guard the scene 24 hours a day, protect the scene, prohibit unauthorized personnel from entering, and prevent the destruction of traces and physical evidence at the scene. At the same time, we will conduct regular patrols of the suspect's escape route and places of stay, such as the dirt road on the north side, the cornfield, and the abandoned well house, to look for traces and physical evidence that may have been missed, especially the murder weapon, the knife. We will focus on searching around the well house, deep in the cornfield, and in the ditches, and strive to find the murder weapon to complete the chain of evidence."

"Fourth, we will launch a search for missing persons information. Based on the deceased's body length, clothing characteristics (black long-sleeved T-shirt, dark blue jeans, black socks), and approximate time of death (about three days), we will connect with the city's missing persons information system to conduct a preliminary screening, focusing on males who have gone missing in the past week, to find missing persons who meet the criteria and confirm the identity of the deceased."

"Fifth, strengthen communication with laboratories, keep abreast of testing progress, and provide immediate feedback once test results are available. Based on the test results, adjust the direction of the investigation, focusing on clues such as the suspect's DNA, footprint characteristics, metal buttons, and cigarette butts to investigate suspicious persons and identify criminal suspects."

"Currently, the key to the case is confirming the victim's identity and identifying the suspect. The trace evidence collected at the scene is crucial to breaking through the case. The technical team must cooperate in the subsequent examination of trace evidence, and the investigation team must intensify its on-site visits and investigations. All teams must cooperate closely and work together to quickly identify valuable clues and advance the case investigation." Lu Chuan's tone was firm, his gaze sweeping over each team member present, conveying clear instructions and unwavering confidence.

"Understood!" all team members responded in unison, their tone firm, and immediately began working according to Lu Chuan's instructions. The technical team members organized the trace evidence and drove to the laboratory to expedite the testing; the investigation team split into two groups: one continued to delve into the village to conduct on-site interviews, while the other investigated vacant farmhouses and the social relationships of relevant individuals; the duty team went to the scene to provide 24-hour on-site protection; and the missing persons information investigation team immediately initiated a systematic screening process. (End of Chapter)