Footprint identification analysis plays a major role in the detection of criminal cases, mostly in delineating the scope of suspects.
The more detailed the identification, the more accurate the range of height, weight, and age, and the better the effect.
Qin Yong forwarded the appraisal analysis report on his mobile phone directly to the working group of the task force.
The next focus of everyone's work is to find middle-aged men between the ages of 34 and 38.
"Teacher Zhou, in your impression, does Zhou Yang have any friends in their thirties who have a disability in their left foot?"
Zhou's father shook his head in confusion: "His friends are not serious, and he never talks about these things in front of us, but if there are, Wang Zhi may know."
The team of Zhang Hui and Ren Qiang People, the focus is on investigating Zhou Yang’s social relationships.
Sun Jun is also asking door to door.
"A middle-aged man, a stranger in his thirties, about 1.75 meters tall, do you have any impressions?"
"I'm not very familiar with it. I got off work at almost midnight yesterday, and Everyone in this apartment is not very familiar, they must all be strangers, right?”
Most inquiries have little effect.
Thirty-four to thirty-eight years old, 1.73 to 1.76 meters tall, weighing about 70 kilograms...
There are too many people like this in the apartment .
Although Lu Chuan’s footprint analysis showed that the little toe of his left foot is missing, we can’t let everyone take off their shoes, right?
While searching for various clues outside, the trace evidence analysis here has also been completed.
"I think the results of this analysis are more useful."
The four of Liu Guodong are discussing the identification results of trace evidence. Some of these identification and analysis results are useful, but most of them are useless.
What Lao Yang said was that trace amounts of substances were collected from the murderer's shoe prints.
It is a kind of sawdust.
“There shouldn’t be sawdust on the rooftop of the apartment. I suspect it was brought by the murderer’s shoe soles.”
"As for these fibers, I think some of them may be the residue of the murderer dragging Zhou Yang."
"It's not of much use."
Trace evidence on the rooftop, including sawdust, was found. Fiber materials were found, soil was found, and seven or eight other substances that may be foreign.
But which one was brought by the murderer is not easy to judge.
"This must be true. If it is the clothes on the murderer, what about the fallen fibers?"
"This is difficult to analyze," Lao Bai shook his head, not agreeing with Lao Yang's judgment.
“By the way, how did the footprint analysis that Xiao Lu just did show that the other party’s left foot is disabled?”
Lu Chuan took a sip of water: “This is relatively simple. The murderer wanted to clean up the scene. The drag marks left a lot of footprints.”
“These footprints include those from standing postures, squatting postures, and footprints left while walking.”
“I. It was found in these footprints that the center of gravity of the left foot shifted, especially when standing and squatting. ”
"When a normal person stands and squats, the center of gravity of the foot will change back and forth, but not left and right."
"But the center of gravity of the murderer's left foot, when standing and squatting, not only changes There are slight changes from front to back, as well as slight changes from left to right. "In addition, based on the clarity of the shoe prints at the scene, it can be determined that the shoes worn by the murderer are old shoes."
" The wear marks on the outside of the forefoot are obviously lighter than those on the outside of the right foot. "
"Combining these, we can basically determine that there is a weak point on the outside of the murderer's left foot, and it should be that the little finger is damaged. That will cause this situation.”
"Of course, I'm not sure whether this kind of disability is acquired or is innate."
Footprint identification and analysis is not only a technical job, but also an experience-based ability.
In criminal investigation, there are actually related books in this area.
For example, there are graphic tutorials on how to measure foot length and foot width, and how to identify the type of gait.
But if this thing is put on paper, many people who have studied it can make a distinction.
However, there are all kinds of shoe prints in reality, and if you want to match them to the graphics on paper... that's not the same thing at all.
Liu Guodong recently studied two books on this knowledge.
Unfortunately, even with Lu Chuan’s guidance, he didn’t understand it.
Not to mention Lao Yang and Lao Bai.
According to their age and career prospects, learning how to use the instruments in the trace evidence analysis laboratory is already a sign of dedication.
Not everyone likes, has the ability, or has the energy to accept new things.
Especially after marriage, the odds and ends of life can destroy any man’s innocent dreams.
Liu Guodong, Yang Sen and Lao Bai have interpreted this truth with a lifetime of experience.
Understand the firewood, rice, oil and salt, understand the children, understand the wife, understand the parents...
In most cases, if you can figure out one thing, you are a great person.
In addition, figure out the work, figure out yourself...
Figure out the dream...
Haha.
The big daddy of life has long made middle-aged men know what it means not to even think about some things.
In the criminal investigation detachment, the most rapid technological development was during the single years.
I have nothing to do but learn something.
But even so, in a team, there are only one or two people who can excel.
For example, in the second action team, there are people who joined the team earlier than Zhang Hui, but the current situation is that, except for Ren Qiang, Zhang Hui leads the team by default.
If it’s something urgent, difficult or dangerous, Zhang Hui will go first.
It's not that the others are not dedicated, it's just that they feel uneasy leaving things to them.
To put it bluntly, most people just do whatever they are told and earn their wages.
Police officers are also human beings, and police officers also have to support their families.
"The identification results of these trace physical evidence should be sent to Team Qin first."
"We are not on the front line and don't know the situation over there. Maybe they can use it."
Liu Guodong made the decision, Lao Yang nodded and went to send the results.
However, the progress at the scene was far worse than Liu Guodong imagined.
Zhou Yang died between 7:30 and 8:30 this morning.
Moreover, the cause of death was drowning, and it was characterized by a high fall.
This means that when the murderer dragged Zhou Yang away, he might have been unconscious, but he was definitely not dead.
At this time point of after seven o'clock, there were no witnesses.
Sun Jun has searched the entire apartment building. From last night to 8:30 today, he asked everyone who had swiped their cards in and out of the building.
As a result, nothing was found.
There are middle-aged men who have similar self-identification and analysis results as Lu Chuan did, and there are quite a few of them. Sun Jun even asked some people with very similar conditions to take off their left shoes to confirm.
But still nothing was found.
Zhang Hui also contacted Zhou Yang's Fa Xiao Wang Zhi.
The other party did provide some information, including some people who had conflicts or grudges with Zhou Yang.
After investigation, all suspicions are eliminated.
Two days passed and nothing was found. (End of this chapter)