Chapter 331 Major Discovery
Lu Chuan frowned and started the third measurement.
"The position of the center of gravity...is correct."
"The virtual edge...one point and five millimeters...typically small feet wearing big shoes...but...how is this possible?"
Lu Chuan's bloodstain pattern analysis skills, although only intermediate, are not as good as fingerprint identification analysis.
However, intermediate skills are definitely at the level of provincial and ministerial experts.
However, the analysis of shoe prints...
Lu Chuan's footprint identification and analysis is a basic skill, and there is a big gap between it and blood stain morphology analysis.
But no matter how big the gap is, it is unlikely that there will be a subversive conclusion.
"Height...1.75 to 1.78 meters...very strong, not old..."
For such an adult, whether he is a man or a woman, his height and weight are here, and his physical fitness is here. Is it possible that the other person has a congenital foot deformity?
A person who is over 1.7 meters tall has feet size 36?
It is possible, but not very likely.
Theoretically speaking, a person's height and foot length are proportional, which is also the basis for footprint identification and analysis.
Of course, some special circumstances, such as congenital deformities, lead to an imbalance in the ratio of foot length and height.
This probability...
One in ten thousand, or one in hundreds of thousands?
If there is no such probability, why does this happen?
What happened at the scene?
Could it be...
Is there more than one murderer?
That’s not right!
Judging from the blood spray marks at the scene and the distance from the door to the bed, it can be determined that the victim was raped by one person.
Because the blood spray is blocked, the number of people present can be mapped.
This judgment does not require special skills. As long as a criminal policeman has seen several cases with similar scenes, he can make a clear judgment.
Just now, several people from the crime team had no doubts about this.
This shows that there was only one person committing violence at the scene.
But what about the shoe prints?
Under doubt, Lu Chuan completed the third measurement.
Foot length, blur edge size, footprint center of gravity position, skeletal analysis's impact on pressure at different positions of the footprint, gait simulation, step angle and step width data...
"Female, between 1.5 and 1.6 meters tall, weighing about 40 kilograms, aged between 20 and 25 years old, slightly bow-legged."
Three measurements, Lu Chuan finally based on the scene Footprints, came to the above conclusion!
This conclusion is completely opposite to the conclusion drawn from blood stain morphology analysis.
What's more, the victim had clearly been sexually assaulted, but the fingerprint analysis showed that he was a woman!
Temporary meeting room of the Crime Unit.
Li Donglin sat in the first place, holding in his hand the bloodstain morphology analysis report and footprint identification analysis report issued by Lu Chuan.
Wang Song, Song Mingguang and others were also sitting.
"Lu Chuan, are you sure these two identification and analysis reports...are OK?"
Lu Chuan nodded affirmatively.
“I can be sure that everyone has the same opinion as me about the shape of the blood stains at the scene.”
"The murderer was only one person, he should be 1.75 to 1.8 meters tall, a young man."
"The shape of the blood stains at the crime scene, the angle and strength of the throwing, etc., can all be used as evidence for this. The conclusion serves as the basis for judgment.”
“Moreover, judging from the direction of the blood spray, it was one person who committed the crime.”
“It should be one person, if it was two people who committed the crime. , the blood spray on the scene will definitely change in different directions."
Illustration by Wang Song, Song Mingguang and others also nodded. It's not hard to see this.
For example, after the victim was injured, whether the sprayed blood was blocked by one obstruction or two obstructions, it can be easily judged based on the fault lines of the blood stain.
“But what about the shoe prints?”
“Your footprint analysis...is that of a woman who is less than 1.6 meters tall?”
About the footprints at the scene, Everyone believed that the murderer wiped the bloodstains, eliminated his own footprints when committing the crime, and returned wearing the victim's shoes.
However, according to Lu Chuan's analysis, it means that there should be another person at the scene.
This person did not participate in the previous harm to the victim, but in the end, she walked into the crime scene wearing the victim's shoes.
Even the knife on the victim's neck was most likely caused by the person who showed up last.
The strong and the last murderer are not the same person?
“Regarding the analysis of footprints, I can say responsibly that the conclusion may have errors, but there will never be any subversive errors.”
"Moreover, the height and weight inferred from the footprints also rule out the possibility of congenital deformity of the murderer's feet."
"I think it is necessary to expand the scope of suspicion and investigate the bloodstain patterns of people living in the apartment building. Couples and couples who have obtained the conclusion of the characteristic analysis and the conclusion of the footprint identification analysis should do key screenings!”
Everyone, including Li Donglin, frowned.
According to the report of the QZ City Criminal Investigation Detachment, they focused on the investigation of single men in the apartment building in the early stage.
Now it seems...
The reason why the murderer was not found is probably because there was a major deviation in their suspicion.
It’s a mistake between two people committing a crime and one person committing a crime. It’s strange that the case can be solved.
But, then again, is the technical analysis done by Lu Chuan reliable?
Li Donglin’s choice gives the answer.
“Based on Lu Chuan’s identification and analysis results, we will reorganize the suspect’s target range.”
"Especially for women, who are between 1.5 and 1.6 meters tall and weigh about 40 kilograms. It shouldn't be difficult to find women with such thin bodies. Let's all work separately!"
...
Except Apart from Lu Chuan, the members of the serious crime team who came this time were all top experts in front-line investigation and solving crimes.
With the general characteristics of the target, the target suspect was quickly identified.
“Room 703!”
A couple in Room 703 who lived on the same floor as the victim Wang Min were completely consistent with the identification conclusion reached by Lu Chuan.
In the past week, the QZ City Criminal Investigation Detachment has already completed basic information collection on more than 300 people living in the apartment building.
Among the more than 300 people, there are more than 100 women and more than 200 men. There are only 4 women in total who meet the conclusion of Lu Chuan's footprint identification analysis.
A single woman lives in room 1108, a single mother lives in room 602, the older sister of two sisters lives in room 909, and the one living in room 703 A couple.
“The woman’s name is Sun Lulu, and she is an online novel writer. The man’s name is Zhang Cheng, and she and Sun Lulu are high school classmates. The physical characteristics of these two people are consistent with the identification conclusions made by Lu Chuan.”
There are six people in the serious crime team, one of whom is responsible for the three floors. After summarizing the information, Wang Song began to report.
"Four people, I suggest interrogation of all of them."
"The focus is on 703!"
"Agree, I recommend a raid on the room where the four people live. ”
Since there has been important progress, and there is a basis for the appraisal conclusion made by Lu Chuan, there is naturally no violation of regulations in the arrest, interrogation, and surprise inspection.
"Action!"
(End of Chapter)