Chapter 114 DNA Information Comparison Results
Conference Room No. 1 of the Criminal Investigation Detachment.
Liu Guodong is reporting on the current survey and inspection.
“First, regarding the identification of the first deceased, there is still no result in terms of fingerprint and DNA information comparison.”
“Yesterday afternoon, we were on the first corpse. Trace physical evidence was extracted and sent to the provincial technical appraisal center this morning, and the results will be available tomorrow.”
"Did you find anything during the physical evidence investigation around the scene?"
The investigation around the scene is a fixed process that must be carried out in every murder case.
The murderer is likely to leave behind his own skin flakes, hair or other physical evidence during the murder.
Liu Guodong shook his head: "We collected a total of 126 pieces of evidence around the scene yesterday, and we have collected fingerprints and DNA samples from all of them."
"Lu Chuan is working on Comparing the collected fingerprints, no major findings have been found so far. ”
"After the incident this morning, we conducted another detailed survey of one kilometer around the scene, and this time collected thirty-six pieces of physical evidence."
"Most of these physical evidence should have arrived yesterday afternoon The added items will be processed today. "
The current survey is not about sweeping the ground. There will always be some omissions in a large-scale survey.
"There are also footprints we found on the outside of the wall. This is the result of footprint analysis."
"Oh? It has been completed?"
Qin Yong took the footprint analysis report handed over by Liu Guodong with some surprise.
Liu Guodong nodded: "After Xiao Lu came back, he analyzed the footprints as soon as possible."
"The suspect is an adult male, 1.84 meters tall and weighs in About 100 kilograms, aged between 35 and 40 years old.”
Compared with yesterday, Lu Chuan and others analyzed the height of the fence and found that the suspect was over 1.8 meters tall. Shoe print analysis leads to more precise conclusions.
“The wear on the outer edges of the suspect’s footprints is more serious than the inner edges, but not by much, indicating that the suspect has a weak external splayed leg shape.”
In fact, most human body types have some flaws.
For example, slight outward splay, internal splay or genu varus are common bow legs.
The formation of these leg shapes is influenced by both genetic genes and acquired development.
For example, calcium deficiency, irregular walking, etc., can cause minor bone deformities in the lower limbs.
Everyone’s leg shape can be judged by analyzing the wear and tear of shoes worn for a long time.
The information at the current survey office is still being sorted out, and Liu Guodong's report is temporarily over.
Qin Yong looked at Wang Changjiang, who coughed lightly.
Lao Wang had a good rest yesterday, because the frozen body had not softened, so he could not do an autopsy for the time being: "The first body has been thawed, and the autopsy can be done later."
"As for the second body A corpse..."
Wang Changjiang paused: "An adult woman, similar in age to the first corpse, probably between twenty and twenty-five years old."
"The cause of death was mechanical asphyxiation. Judging from the size and shape of the neck pinch marks, the murderer of the first corpse should be the same person."
Liu Guodong nodded, this was also confirmed by him of.
The positions of the pinch marks on the necks of the two corpses are similar, and it can be inferred that the size of the murderer's palms is basically the same.
Moreover, the other party wore gloves when he strangled the victim.
Lu Chuan did not find any fingerprints on his neck.
"The body has no injuries during life, and no traces of insults before or after death have been found."
The blood stains on the snow were dripped from the body after the murderer scraped the wall and damaged the skin during the process of dumping the body. .
From the shape, size and friction marks of the wound, compared with the residual blood stains on the fence, it can be determined that it was left after death.
The scars left when a person is alive are different from the scars left after death.
Because the human body is active and the blood is circulating, there will be obvious defensive reactions when injured before death, which is academically called life reactions. This defense response not only refers to the active defense of the injured person, but also refers to the body activity response of the injured part.
Such as bleeding, coagulation, muscle twitching, cell division during the healing process, etc.
Among Lu Chuan’s system rewards, in Forensic Pathology, there are skill cards for identification and analysis of antemortem and postmortem injuries.
“We will conduct an autopsy on the first corpse later, and the report will be available in the evening. The second corpse will have to wait for the autopsy tomorrow.”
……
The current survey office.
Lu Chuan, who has completed the shoe print analysis, is comparing the fingerprints found on the physical evidence collected from around the crime scene yesterday.
Advanced fingerprint identification and analysis skills allow Lu Chuan to advance very quickly when dealing with this level of fingerprint comparison.
It only takes about three to five minutes to process a fingerprint. After returning from the scene and analyzing the footprints, Lu Chuan had already completed half of the work.
Yang Sen and Lao Bai are processing the physical evidence brought back from the scene this morning.
"What did the murderer think, dumping the body twice in one place?"
Lao Bai has been a criminal policeman all his life and has never seen any cases.
Twenty years ago, there was a series of murders on rainy nights. The murderer specifically targeted young women in red clothes riding bicycles on rainy nights.
That year, seven people were killed, causing panic in the entire Haizhou City.
In the end, no woman dared to wear red clothes, let alone going out on a rainy day.
Seventeen years ago, in the corpse mutilation case in the southern suburbs, the murderer killed four people at the same time. A family of four was wiped out. All the corpses were minced, put into woven bags and thrown into sewers, trash cans, and septic tanks.
There are twelve bags in total, one of which was brought by Lao Bai for investigation, with four left legs.
The poisoning case twelve years ago, the arson case eight years ago...
Lao Bai's experience fully illustrates what it means to live for a long time.
But this time, the murderer dumped his corpses continuously at the same place, which was the first time Lao Bai saw it.
Yang Sen scanned his fingerprints and shook his head: "The murderer most likely has a deeper reason for doing this."
"Either he is mentally abnormal, has obsessive-compulsive disorder, or has some other reason that forces him to do this. "
"Normal people...can't do this"
Didi!
The two were chatting when the DNA testing equipment beside them buzzed.
Yang Sen looked back: "The DNA test results of the second corpse are out. I'm going to run around on the computer."
Lu Chuan had already collected the fingerprints of the second corpse at the dumping site.
After returning to the office, I conducted an identification analysis immediately, but it was a pity.
Like the first body found yesterday, the fingerprint comparison was unsuccessful.
There is no target person in the fingerprint system of Haizhou City Criminal Investigation Detachment.
The face comparison is in the missing door library, and there is no corresponding information.
It stands to reason that in this case, if you collect DNA information for comparison, there is a high probability that there will be no chance of success.
Because of the DNA information database of Haizhou City Criminal Investigation Detachment, 90% of its owners have been fingerprinted.
The fingerprints are not matched, and the possibility of successful DNA information comparison is not very high.
However, there must be a reason for the existence of the criminal investigation process.
bite!
Yang Sen had just entered the DNA information of the second corpse into the system and started comparing it. Before he could turn around, the computer beeped saying that the comparison was successful!
(End of this chapter)