Bloodstain morphology analysis is a very important discipline in criminal investigation. When Lu Chuan was in college, he studied.

It's just that the knowledge learned in school is relatively shallow, and there is no practical support, so a lot of theoretical knowledge cannot be applied to practice.

In addition, the analysis of bloodstain morphology often needs some experimental support in the detection of actual cases.

The skill cards awarded to Lu Chuan by the system contain most of the content. The amount of blood and the height of the bleeding point to the surface of the drip can be distinguished according to the size of the blood stain.

Combined with the extraction of blood DNA information, a considerable amount of field information can be obtained. For example, the bloodstain found by Lu Chuan is relatively regular and circular, and there are fewer blood burrs around it.

This shows that the height of the blood stain is not high, and when the blood stain is dripping, the bleeding point and the landing point are in a relatively static state.

After taking the current survey box, Lu Chuan took out the vernier caliper and measured the shape and size of the bloodstains.

"If this bloodstain is not the deceased, it is very likely to be related to the murderer, I will try to analyze it." The height of the blood dripping can be analyzed by measuring the diameter and thickness of the blood stain and then comparing it.

"Drip height...... 0.72 meters. ”

"Bloodstains fall freely, without ...... declination" is of great significance to the reconstruction of the crime scene for the current investigation master.

The shape of a bloodstain can even mark all the paths of the murderer and the victim at the scene.

The data measurement and calculation were quickly completed, and Lu Chuan had to purify the genetic components in the bloodstains. If DNA information can be extracted, it will be of great help to solve the case.

When Lu Chuan made a discovery, the investigation of the action team was also going on, and there was a lot of progress!

Happy Home Community, Neighborhood Committee.

"Zhang Wei you said is a taxi driver."

"This person is good, very honest, very familiar with us, is a warm-hearted, we are all relocation houses here, and everyone used to be neighbors."

"It's just that I have an unconscious son...... "The aunt of the neighborhood committee is not only very enthusiastic, but also very cooperative with the work of the police.

Zhang Hui asked as he made some notes.

"Why isn't his son worried?" Another aunt in a red down jacket poured a glass of water for Zhang Hui: "Hey, what can you not worry about, isn't there just no job, how many people in our community have formal jobs?" ”

"Who hasn't bothered yet?"

"These two days...... Is there anything unusual about Zhang Wei? ”

"Anomalous...... Comrade police officer...... Did Zhang Wei commit something? "It's obviously not the first time that my aunt has cooperated with the police, and I know that Zhang Wei may have had an accident after a few questions.

However, it is probably unlikely. This morning, she saw Zhang Wei out of the car. Zhang Hui waved his hand: "Nothing happened, something happened on the side of the folk street last night, Zhang Wei drove by, we have to check according to the regulations." "Passing by?

The aunt nodded, her expression relaxed, if she passed by, it would be fine. But then his expression became nervous again: "Folk Street? ”

"I heard over there...... Is there a broken ......?" the aunt didn't finish, and her face turned pale.

"Auntie, it's okay, our police are here, it's okay!" All the investigation visits of the criminal police in handling cases stipulate that the facts of the case cannot be disclosed at will.

However, only those who have actually done the work of visiting know that if you keep it secret, it means that others will keep it secret.

Zhang Hui is a veteran in this regard, and he knows that he can't deny it, but he can't say much.

"Auntie, let's talk about Zhang Wei, has he had anything unusual lately?" Sure enough, Zhang Hui's words calmed down the aunt a little: "Hey, you have to solve the case quickly......"

"Oh, that Zhang Wei is nothing abnormal, I met him this morning and went to see my son on a trip."

"Tourism? Is he gone too? ”

"I don't know about this, I said hello early in the morning, and said that I would send my son to the airport...... "Fifty-six cars, it didn't take an hour to thoroughly check fifty-four cars."

The remaining two cars, one is Zhang Wei's taxi, which has not yet been found. Zhang Wei's phone couldn't get through.

The other one went to Tianzhou City early this morning.

"Immediately contact the Tianzhou City Criminal Investigation Detachment, the other party's vehicle is now on the highway, stop him at the exit!" Judging from the current judgment, it is very likely that the murderer drove the vehicle to throw the body, so there will be more or less traces left in the car.

It's not hard to check.

"There is also Zhang Wei's taxi, notify the traffic police detachment and look for it with all your might!" In the huge city of Haizhou, it is not easy to find a taxi.

In TV dramas, the kind of system that can locate the other party's vehicle as soon as you enter 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 of major intersections in real time.

It can carry out roving and query monitoring of real-time monitoring of important intersections. This is already a relatively advanced traffic management system in China.

The so-called input of the license plate number, query information, can only find the information of vehicle registration, as for the query location, it is impossible.

At this time, it shows how much attention the murder case has received in the Haizhou City Public Security Bureau. All field traffic police, all dispatched, all major intersections are covered!

"I didn't find it at the intersection of Youyi Road and Medical College Road!"

"The road for women and children has not been found!"

"Tiantong Road has not been found!" In the traffic management command hall, reports one after another gradually sounded. This kind of thing, the traffic police detachment has not done it once or twice.

In the past two years, Zhang Yongzhi, the head of the traffic police detachment, has even often organized similar inspection drills in order to improve the speed of emergency response.

Find a random car and go out with all the staff!

"Report report!"

"The target vehicle was found at the intersection of Qingfeng Road and Youyou Road!"

"At the intersection of Qingfeng Road and Youyi Road, find the target!" Zhang Yongzhi, who was directing the inspection in the hall, was in a big spirit!

"Good!"

"Don't act rashly, don't act rashly!"

"Report the location at any time, and monitor Qingfeng Road and Youyou Road for me!"

"Notify the criminal investigation detachment and let them arrest someone!" The traffic police detachment is on the line of finding a car, but it takes professionals to arrest people.

The other party is suspected of being the murderer of the corpse shredding 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 already replied to the news. There is no problem with the car stopped at the highway intersection.

Last night, there were only fifty-six cars passing through Folk Street. Fifty-five cars are fine, and the remaining one has a much higher chance of having an accident.

What's more, Zhang Wei didn't answer the phone and couldn't be contacted, so the suspicion was even greater! The arrest went unusually well.

When waiting for the red light at the intersection of Qingfeng Road and Women's and Children's Road, Ren Qiang and others rushed up, and the taxi was blocked in traffic and had nowhere to escape.

"What's it called?"

Zhang ...... Sheet...... Great. ”

"Do you know why you caught you?"

"Know...... I...... I killed someone......"