flstandardbreds Chapter 770 The killer's characteristics: I recognize this person!
Chapter 770 The killer's characteristics: I recognize this person!
With the footprint identification analysis provided by Qin Chuan, including the height of the two suspects and the distinctive features of one of them, Chen Jianguo and his team could significantly narrow down their search area.
Currently, after investigating the social relationships of the victim's family of four, the Criminal Investigation Detachment has identified a total of 36 related individuals.
These 36 individuals are the focus of the Criminal Investigation Division's investigation and verification efforts.
After leaving Qin Chuan's office, Chen Jianguo immediately went to the Criminal Investigation Detachment to meet with Chen Kai and the others.
"Just now when I was giving a report in Director Qin Chuan's office, Director Qin gave me a footprint analysis. The height characteristics of the two suspects, as well as the body shape characteristics of one of them, are all here."
Chen Kai took the scratch paper that Chen Jianguo handed him.
"Director Chen, you said that the footprint identification analysis done by Director Qin was done by him personally?"
Although Chen Jianguo had worked as a criminal police officer, he had spent most of his time overseeing traffic police work after his promotion. He only had some basic experience in criminal investigation, and he was not as familiar with the specific details as Chen Kai.
Chen Kai has been working in criminal investigation for over twenty years. Since entering the police force, he has served as a criminal investigator, working his way up from a field officer in the criminal investigation branch to his current position as the branch chief. He has solved countless cases.
Moreover, the gradual improvement and breakthroughs in criminal investigation technology in recent years have mainly occurred in the last ten or twenty years, especially in the last 10 years. The development of science and technology has also given rise to many new methods for criminal investigation.
It can be said that the entire on-site investigation office of the Criminal Investigation Detachment of Nanchuan City was basically set up by Chen Kai.
The fingerprint technicians and internal affairs personnel trained by the Criminal Investigation Detachment were all personally trained by Chen Kai. Chen Kai knew better than anyone what level these people were at and what advancements they had made in the development of some of the current advanced investigative methods.
In reality, the most important and widely used methods in solving cases are still fingerprint identification and analysis, and DNA identification technology.
Compared to the past, fingerprint identification and analysis now incorporates a fingerprint database, unlike before when all personnel had to use a magnifying glass to examine each fingerprint card one by one.
Current fingerprint comparison systems only require fingerprint identification personnel to find a certain number of feature points on a fingerprint before the system automatically performs the comparison.
If a fingerprint has many unique features and the fingerprints collected at the crime scene are complete, then it is very likely that the system can directly identify the suspect.
However, if the fingerprints found at the crime scene are not particularly complete, because fingerprints found at the crime scene may be distorted or imprinted on deformed objects, there will be errors in the extraction of feature points.
In this way, the fingerprint identification and analysis system will sort these feature points according to their quantity, from low to high, and list similar fingerprints in order. Then, fingerprint identification personnel will manually verify these similar fingerprints.
This fingerprint identification system has been developed for over a decade or two and can be considered quite mature.
This is also one of the most widely used techniques in criminal investigation, followed by DNA testing.
With the advancements in crime scene investigation techniques and the application of cutting-edge scientific equipment, even trace biological information left by criminal suspects at crime scenes can now be collected.
For example, it used to be very difficult to extract DNA information from trace amounts of skin flakes. However, with the advancement of technology, the analysis of such trace evidence is gradually becoming more sophisticated, and DNA information can be obtained from only a tiny amount of human tissue.
If the general range of suspects is narrowed down, then DNA testing and comparison can very likely lead to the identification of the suspects.
Besides, footprint identification and analysis is an old method in criminal investigation, but compared with fingerprint identification and DNA identification, the application of footprint identification and analysis is not so widespread, mainly because footprint identification and analysis is very difficult.
Some forensic investigators with limited technical skills can only compare footprints. For example, after arresting a suspect, they can take a rubbing of his footprints and then compare them. Even so, it is possible that two people might be wearing the same shoe size.
There is a very limited pool of people skilled in footprint identification.
The Criminal Investigation Detachment of the new Public Security Bureau in Nanchuan City did not have any particularly strong personnel in this field, so when Chen Jianguo handed over the footprint identification and analysis data done by Qin Chuan to Chen Kai, the first reaction of the other party was surprise and shock.
Qin Chuan is now the bureau chief, how could he possibly be an expert in footprint identification and analysis? But when he received the relevant results from above, he was stunned.
Chen Kai had previously participated in many training sessions organized by higher authorities. For example, the training organized by the provincial department mentioned some footprint identification experts. Some particularly skilled experts could identify the gender, age range, occupation characteristics, and so on of criminal suspects based on footprints.
There are very few footprint identification experts capable of this level, not only in Nanchuan City, but also within the entire public security system; it is estimated that there are no more than twenty or thirty people.
There might not even be one person like that in an entire province.
可秦川做出的这份足迹鉴定分析明确标明了两个犯罪嫌疑人的性别。都是男性，身高一位在1米60左右，另一位在1米75左右，关键是一位1米75的犯罪嫌疑人左脚有一点跛脚。
"This this……"
Looking at the limping figure and the fact that one of them was 160cm tall, Chen Kai's mind flashed through the information of the two people.
"Director Chen, it seems we've identified a suspect!"
Chen Jianguo was also taken aback, but then he understood what was going on.
"You've identified a suspect? You mean there are people in our current pool of suspects who fit these two characteristics?"
Chen Kai nodded affirmatively.
“The neighbor of this victim matches this height, 1.75 meters tall, with a slight limp in his left leg, and he was the one who reported the crime!”
Neighbor?
The person who reported the crime?
"The person who filed the report? Tell me more about what happened."
Chen Jianguo pressed for an answer.
"That's right. After the incident, we investigated the building where the suspect lived, especially the neighbors upstairs and downstairs, who were all within our key investigation scope."
Chen Kai began to give a detailed report on the relevant case investigation process and situation, as well as the specific information of the two individuals.