Chapter 154 Confession
Bloodstain morphological analysis is a very important subject in criminal investigation.
Lu Chuan studied it when he was in college.
It’s just that the knowledge learned in school is relatively shallow, and without practical support, a lot of theoretical knowledge cannot be applied in practice.
In addition, blood stain morphological analysis often requires some experimental support in the detection of actual cases.
The skill card awarded to Lu Chuan by the system contains most of the content.
For drip-shaped blood stains, information such as the amount of bleeding and the height from the bleeding point to the dripping surface can be determined based on the size of the blood stain shape.
Combined with blood DNA information extraction, considerable on-site information can be obtained.
For example, the blood stain discovered by Lu Chuan was in a more regular round shape with fewer burrs around the blood stain.
This shows that the dripping height of the blood stain is not high. When the blood stain drips, the bleeding point and the landing point are relatively stationary.
After taking out the discovery box, Lu Chuan took out a vernier caliper and measured the shape and size of the blood stain.
"If this blood stain does not belong to the deceased, it is very likely to be related to the murderer. I will try to analyze it."
The round drop-shaped blood stain is measured by measuring the diameter and thickness. The data is then compared and analyzed to analyze the height of the blood dripping.
"The drop height...0.72 meters."
"The blood stains fell freely, without any deflection..."
For spot investigation experts, bloodstains are of great significance in reconstructing crime scenes.
A bloodstain shape can even mark all the action paths of the murderer and the victim at the scene.
The data measurement and calculation were completed quickly, and Lu Chuan wanted to purify the genetic components in the blood stains.
If DNA information can be extracted, it will be of great help to the detection of the case.
When Lu Chuan made a discovery, the investigation work of the action team was also in progress, and great progress was made!
Happy Home Community, neighborhood committee.
“The Zhang Wei you are talking about is a taxi driver.”
“This guy is nice, quite honest, he is familiar with us, and he is warm-hearted. We are all relocation houses here. We used to be neighbors.”
“I just have a troubled son...”
The neighborhood committee aunt is not only very enthusiastic, but also very cooperative with the police’s work.
Zhang Hui asked while taking some notes.
“Why is his son so troubled?”
Another aunt in a red down jacket poured Zhang Hui a glass of water: “Hey, there’s nothing to worry about, isn’t it? Don’t you have a job? How many people in our community have formal jobs?”
“Who’s not worried yet?”
“Is there anything unusual about Zhang Wei in the past two days? ?”
"Abnormal...comrade policeman...Did Zhang Wei commit something?"
Obviously this was not the first time that Aunt cooperated with the police. After a few questions, she knew that something might have happened to Zhang Wei.
However, it is probably unlikely.
She saw Zhang Wei getting out of his car this morning.
Zhang Hui waved his hand: "Nothing happened. There was something going on at Folk Street last night. Zhang Wei drove by. We have to check according to regulations."
Passing by?
The aunt nodded and her expression relaxed. If she was passing by, it would be fine.
But then his expression became nervous again: "Folk Custom Street?"
"I heard over there... is there something broken..."
The aunt didn't finish her sentence, her expression changed. He became pale.
"Aunt, it's okay. Our police are here, it's okay!"
In all investigations and interviews during the criminal police's handling of the case, it is stipulated that the facts of the case cannot be disclosed at will.
However, only those who have actually done the interviewing work know that if you keep it secret, it means others will keep it secret too.
Zhang Hui is a veteran in this area and knows that he cannot deny it, but he cannot say more.
"Auntie, tell me about Zhang Wei. Has he done anything unusual recently?"
Sure enough, Zhang Hui's words made the aunt calm down a little: "Hey, you have to solve the case quickly..."
"Oh, there is nothing unusual about Zhang Wei. I met him this morning. I went to send my son on a trip.”
“Traveling? Is he leaving too?” “I don’t know about that. I said hello early in the morning and said I would send my son to the airport...”
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Fifty-six vehicles, it took less than an hour to thoroughly check fifty-four vehicles.
One of the remaining two cars is Zhang Wei's taxi, and its whereabouts have not been found yet.
Zhang Wei’s phone also couldn’t be reached.
The other car went to Tianzhou City early this morning.
"Contact the Tianzhou City Criminal Investigation Detachment immediately. The other party's vehicle is now on the highway. Stop him at the exit!"
Based on the current judgment, it is very likely that the murderer drove the vehicle and dumped the body. If it is large, there will be traces left in the car.
It's not difficult to check.
"There is also Zhang Wei's taxi. Inform the traffic police detachment and try our best to search for it!"
In the huge Haizhou City, it is not easy to find a taxi.
In the TV series, the system that can locate the other vehicle by inputting the license plate number does not exist in reality.
The road traffic monitoring system of the Haizhou Traffic Police Detachment can display the traffic flow at major intersections in real time.
It can conduct tour broadcast and query monitoring of real-time monitoring of important intersections.
This is already the most advanced traffic control system in China.
The so-called entering the license plate number and querying information can only find the vehicle registration information. As for querying the location, it is impossible.
At this time, it shows how seriously the murder case is taken by the Haizhou City Public Security Bureau.
All field traffic police are out in full force, covering all major intersections!
“Nothing was found at the intersection of Youhao Road and Medical College Road!”
“Nothing was found at the Women’s and Children’s Road!”
“Nothing was found at Tiantong Road!”
In the traffic control command hall, one after another The reports gradually sounded.
The traffic police detachment has not done this kind of thing once or twice.
In the past two years, Zhang Yongzhi, the leader of the traffic police detachment, has often organized similar patrol drills in order to improve the speed of emergency response.
Find a car at random and send everyone out!
"Report report!"
"Target vehicle found at the intersection of Qingfeng Road and Youhao Road!"
"Target found at the intersection of Qingfeng Road and Youhao Road!"
Zhang Yongzhi, who was conducting inspections in the hall, was mentally shocked!
"Okay!"
"Don't act rashly, don't act rashly!"
"Report the location at any time, and adjust the surveillance of Qingfeng Road and Youhao Road to me!"
“Notify the criminal investigation detachment and ask them to arrest the person!”
The traffic police detachment is good at finding cars, but it takes professionals to arrest people.
The other party is the suspected murderer of the corpse dismemberment case. Who knows if he has a weapon in his hand.
Qin Yong, who got the news, went into battle in person.
Because just now, the Tianzhou City Criminal Investigation Detachment has responded to the message.
There is no problem with the car stopped at the highway intersection.
Last night, there were only fifty-six cars passing through Folk Street.
The fifty-five cars are fine, but the possibility of something happening to the remaining one is greatly increased.
What's more, Zhang Wei doesn't answer the phone and cannot be contacted, which makes the suspicion even greater!
The arrest went exceptionally smoothly.
While waiting for a red light at the intersection of Qingfeng Road and Women and Children's Road, Ren Qiang and others rushed up. The taxi was stuck in traffic and had nowhere to escape.
"What's your name?"
"Zhang...Zhang...Wei."
"Do you know why you were arrested?"
"Know...I...I kill people It’s..."
(End of this chapter)