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

Footprint identification analysis plays a role in the detection of criminal cases, most of which delineate the range of suspects.

The more detailed the identification, the more accurate the range of height, weight, and age, the better the effect.

Qin Yong forwarded the identification and analysis report on his mobile phone directly to the working group of the task force.

The next focus of everyone's work revolves around finding middle-aged men between the ages of 34 and 38.

"Mr. Zhou, in your impression, does Zhou Yang have any friends in their 30s who have a disabled left foot?"

Zhou's father shook his head in confusion: "His friends are not serious people, and he never said such things in front of us, but if there were, Wang Zhi might know."

The group of Zhang Hui and Ren Qiang focused on investigating Zhou Yang's social relations.

Sun Jun is also asking door to door.

"A middle-aged man in his 30s, a stranger with a height of about 1.7 meters five, do you have any impression?"

"I'm not very familiar with it. It was almost midnight when I got off work yesterday, and everyone in this apartment is not very familiar with it. They should all be strangers, right?"

Most inquiries don't have much effect.

From 34 to 38 years old, with a height of 1.7 meters 1.7 to [-] meters [-], and a weight of about [-] kilograms...

There are too many people like this in the apartment.

Although in Lu Chuan's footprint identification analysis, there is a judgment that the little finger of the left foot is missing, but we can't let everyone drag the shoes off, right?

While looking for various clues outside, the analysis of trace physical evidence on the current survey has also been completed.

"I think the results of this analysis are more useful."

The four of Liu Guodong were discussing the identification results of trace physical evidence. Some of these identification and analysis results were useful, but most of them were useless.

What Lao Yang said was that trace substances were collected from the murderer's shoe prints.

It is a kind of sawdust.

"There should be no sawdust on the roof of the apartment. I suspect it was brought by the soles of the murderer's shoes."

"As for these fibers, I think some of them may be leftovers from the murderer dragging Zhou Yang."

"Not very useful."

Trace physical evidence on the roof includes sawdust, fibrous materials, and soil, and seven or eight kinds of 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's body, what about the fibers that fell off?"

"It's hard to analyze," Lao Bai shook his head, not agreeing with Lao Yang's judgment.

"By the way, Xiao Lu just did the footprint identification analysis, how can you tell that the other party has a disability in his left foot?"

Lu Chuan took a sip of water: "This is relatively simple. The murderer left a lot of footprints in order to clean up the dragging traces at the scene."

"These footprints are from standing postures, squatting postures, and footprints from walking around."

"I found that in these footprints, the center of gravity of the left foot has shifted, especially when standing and squatting."

"When a normal person stands and squats, the center of gravity on the feet will change back and forth, but will not change left and right."

"But the center of gravity of the murderer's left foot not only changed from front to back when standing and squatting down, but also slightly from side to side."

"In addition, according to the clarity of the shoe prints at the scene, it can be judged that the shoes worn by the murderer are old shoes."

"The wear marks on the outside of the forefoot of the left foot are obviously shallower than the outside of the forefoot of the right foot."

"Combined with these, it can basically be judged that the outside of the murderer's left foot is not stressed. It should be caused by the deformity of the little finger."

"Of course, it's not quite sure whether this kind of incompleteness is acquired, or it's just like this."

Footprint identification and analysis is not only a technical activity, but also an experience-based ability.

In criminal investigation, there are actually books related to this aspect.

For example, how to measure the length and width of the foot, and how to distinguish the type of gait, there are graphic teaching.

But put this thing on paper, and many people who have studied it can make a distinction.

However, in reality, there are various shoe prints, and I want to correspond to the graphics on paper...

That's not a thing at all.

Liu Guodong recently found two books on this knowledge and studied them.

Unfortunately, even with Lu Chuan's guidance, he didn't fully understand.

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 dedication.

Not everyone likes, or is capable, or has the energy to accept new things.

Especially after marriage, the trivialities of life can obliterate any man's innocent dreams.

Liu Guodong, Yang Sen and Lao Bai explained this truth with their lifetime experience.

Understand the daily necessities, the children, the daughter-in-law, and the parents...

In most cases, a person who can figure out one thing is a great person.

In addition, figure out the work, figure out yourself...

Figure out the dream...

Ha ha.

The big pockets of life have long let middle-aged men know what it means to not even think about some things.

In the criminal investigation detachment, the time when technology is developing the fastest is the days of being single.

Nothing to do, only to learn things.

But even so, in a team, there are only one or two people who can stand out.

For example, in the second group of action, there are also people who joined the team earlier than Zhang Hui, but the current situation is that, except for Ren Qiang, Zhang Hui is the default leader.

For urgent, difficult and dangerous matters, Zhang Hui will go first.

It's not that other people are not professional, it's just that they don't feel relieved to entrust the matter to them.

To put it bluntly, most people just do what they are asked to do, and what they earn is their wages.

Police are people too, and police officers have to support their families.

"Let's send the identification results of these trace evidence to Team Qin first."

"We are not on the front line, and we don't know the situation there, maybe they can use it."

Liu Guodong made a decision, Lao Yang nodded and went to send the results.

However, the progress on the scene was far worse than Liu Guodong imagined.

Zhou Yang died between 07:30 and 08:30 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 the time point after seven o'clock, there were no witnesses.

Sun Jun has searched the entire apartment building. From last night to today at 08:30, everyone who has swiped their cards to enter and exit the building has been asked.

As a result, nothing was found.

There are middle-aged men similar to Lu Chuan's self-appraisal and analysis results, and there are quite a few of them. Sun Jun even asked some people with close conditions to take off their left shoes to confirm.

But still not found.

Zhang Hui also got in touch with Zhou Yang's friend, Wang Zhi.

The other party did provide some information, including some people who had conflicts or enmity with Zhou Yang.

It can be investigated, and all suspicions have been ruled out.

Two days passed with nothing. (end of this chapter)