The results of the comparative analysis of the two sets of footprints surprised Liu Guodong and the others.
"A boy and a girl?"
Lao Bai took the analysis report and read it carefully: "Xiao Lu, are you right?"
Lu Chuan shook his head. He was a little unsure about the identification and analysis results at first.
In murder cases, judging from the historically found gender probability of the murderer, the proportion of women is relatively low.
When Lu Chuan was in college, he was exposed to probability analysis data in this area.
Men are naturally superior to women in terms of physical strength and courage.
Murder is often not only a technical job, but also a physical job. In particular, many murder cases involve hiding and moving corpses.
However, in some premeditated murder cases, the proportion of women is higher than the gender probability of the murderer as a whole.
This is also the reason mentioned above. Women's physical strength is average. Compared with men, women's methods of killing are more inclined to poison or other technical killing methods.
However, a man and a woman kill...
It is indeed uncommon in cases of non-committal homicide.
"This set of footprints," Lu Chuan picked up one of the photos of the footprints: "This set of footprints, on the surface, are traces left by men's size 41 sneakers."
"However, the internal and external, front and rear forces of the footprints are uneven, and the center of gravity of different sets of footprints shifts forward and backward."
"I carefully analyzed the force size and stress points on the heels and palms of these sets of footprints, combined with the depth of the shoe prints, and calculated that the person wearing these shoes weighed less than 50 kilograms and was 1.65 meters tall. about."
"And here," Lu Chuan inserted the shoe print photo into the backlight board and took out another shoe print photo: "This is a photo of the right foot of two sets of unfamiliar shoe prints."
"Both pairs of shoes are size 41 sneakers, but they have different textures."
"But their edge wear, the heel...the sole of the foot...the outer edge and the inner edge have different levels of wear, but the wear parts are basically the same."
"What does this mean?"
Liu Guodong and the other three are also experienced surveyors, although they are not that experienced in footprint analysis.
But the general situation can still be distinguished: "The degree of wear is different, but the wear parts are the same. Are these different shoes worn by the same person?"
Lao Bai gave the analysis that Lu Chuan wanted to hear.
Yang Sen nodded and continued: "It's just because the purchase time is different, that's why this situation occurs?"
"One cannot wear two pairs of shoes at the same time and show up at the same place."
Liu Guodong took off the photo of shoe prints that Lu Chuan first put on the backboard: "There were two people at the scene. One of the women wore a man's shoes?"
"Yes, that should be the case."
Both sets of shoe prints were relatively clear. Although Lu Chuan had mastered the ability of primary footprint identification and analysis, shoe prints of this level of clarity could generally be analyzed in an hour.
This time, the main reason why I spent half of the night was to deal with the shoe print.
"But why?"
Lao Bai shook his head: "Why does this woman want to wear the other person's shoes?"
"They did not clean up the shoe prints left behind, which shows that the other party has no counter-reconnaissance awareness in this regard."
"If not, then why does this woman wear men's shoes?"
Lao Bai's problem is indeed a problem.
But Liu Guodong shook his head: "There's nothing strange about this."
"It rained last week and I went to pick up my wife. There was a waterway in front of the unit. My wife took off her high heels and wore the spare police boots that were in the trunk of my car."
"The ravine is very rustic. If the other party is wearing high heels, it would be reasonable to temporarily put on his accomplice's sneakers."
"In this way," Liu Guodong finally made the decision: "Let's send the report to Team Qin first and tell them our guesses."
"Leave the rest to Ren Qiang and the others."
"The key is..." Liu Guodong looked at Lu Chuan: "How accurate... is this identification analysis?"
Lu Chuan paused. He knew what Liu Guodong meant.
The current investigation office is responsible for the identification and analysis of physical evidence.
Reasoning and solving crimes are not their thing, and they are not good at it.
The key task of the current survey office is to produce powerful and accurate analysis reports.
Provide technical support for front-end investigation and analysis.
"The identification results of male footprints are more than 90% certain."
"The accuracy of women's reports...70%! At least 70% sure."
Ninety percent, seventy percent!
"This accuracy rate is already very high."
Liu Guodong has been doing spot inspections and trace inspections for so many years, and he knows that nothing is 100% accurate.
Especially when it comes to physical evidence analysis, no one dares to say that what they are doing is absolutely correct.
They can only try their best to come up with a relatively accurate identification result.
Therefore, generally speaking, most criminal police officers are unwilling to touch cases with zero confession.
It’s not that there’s anything wrong with this method of handling the case, but it’s just that due to the psychological impact, without a confession, it always feels like it lacks some meaning.
Just like relaxing in a KTV, just singing is fun, pleasing the body and mind, and cultivating one's sentiments.
But if I don’t go upstairs, I always feel like something is not done.
That's what it means to be scratching your head.
Life must be complete. It cannot be just the foreplay of life, but also the venting of dissatisfaction.
Just like a clogged faucet, just spray out the dirty stuff.
As the famous saying goes: General rules don’t hurt.
Conference room one.
Qin Yong has been taking command all night.
"Tell Yuan Shaokang that starting from the first prisoner Song Kun arrested, I want all the suspect information related to Song Kun."
"When the crime occurred today, let the people from the High-tech Zone Criminal Police Brigade investigate where they were and whether they had alibi. No one can be missed."
"What happened to Song Kun's disappearance before his accident?"
"And he went to the orphanage to deliver apples. Does anyone know how long this has been going on?"
"It's definitely not a coincidence that the other party took action on Longjiang Road. He must have figured out Song Kun's habits."
"Don't give me reasons. Tell the traffic police team that all vehicles within a ten-mile radius must be investigated!"
"No one? I'll borrow it if there's no one. Bureau Song has sent a message. If the city's police force needs it, all the archivists will help me!"
Qin Yong's hair has exploded into a chicken nest.
A criminal police officer who was about to retire was killed in a faked car accident. There must be something hidden behind it.
The police can die because they died on duty, it doesn't matter.
This happens every year.
But being killed in a faked car accident, what is that?
This is a provocation to the police!
The case has been reported to the provincial department, and the leaders take it very seriously.
The head of the provincial department personally called Director Song Jiangguo.
The only requirement is that the case must be solved.
They want to give an explanation to all the police.
However, more than ten hours have passed since Song Kun was killed, and the progress of the case has been very limited.
Apart from the burned vehicle, there were no other clues.
Qin Yong even felt that there was a sharp sword hanging above his head at all times.
And it will fall down at any time.
This case cannot be solved...
Qin Yong, the captain, has almost come to an end.
If Song Jiangguo didn't remove him from his post, he himself would have no shame in continuing to work.
bump!
The door to the conference room opened, attracting everyone's attention.
Qin Yong's eyes lit up when he saw it was Liu Guodong.
"Old Liu, is there any good news?"
