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, bloodstain morphology 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 bloodstains in the shape of dripping, 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 bloodstain 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 bloodstain is not high. When the bloodstain 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 bloodstain does not belong to the deceased, it is very likely to be related to the murderer. I will try to analyze it." By measuring the diameter and thickness of the round drop-shaped bloodstain, and then conducting comparative analysis, the bloodstain can be analyzed. Drop height.
"The drop height...0.72 meters."
"The blood stains fall freely, without any deflection..." For spot investigation experts, blood stains are of great significance in reconstructing the crime scene.
The shape of a blood stain can even mark all the movement 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 discovered something, 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 and honest. He is very familiar with us and is a warm-hearted person. We are all resettlement houses here and we were all neighbors before."
"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 isn't his son worried?" Another aunt in a red down jacket poured Zhang Hui a glass of water: "Hey, what's the reason for worrying? Isn't it just that he doesn't have a job? There are several people in our community who have jobs. Officially employed?"
"Who's not worried yet?"
"Is there anything unusual about Zhang Wei in the past two days?"
"Abnormal...comrade police...did Zhang Wei commit something?" It was obviously not the first time that the 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 passed by, it would be fine. But then his expression became nervous again: "Folk Street?"
"I heard over there... is there something broken..." The aunt's face turned pale before she could finish her sentence.
"Aunt, it's okay. Our police are here, it's okay!" All investigations and visits by 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 interview 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, let's talk 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's nothing unusual about Zhang Wei. I met him this morning and went to send my son on a trip."
"Travel? Has he left too?"
"I don't know about this. I said hello early in the morning and said I would take my son to the airport..." There were fifty-six cars, and it took less than an hour to thoroughly check fifty-four of them.
One of the remaining two cars is Zhang Wei's taxi, and its whereabouts have not been found yet. Zhang Wei’s phone number couldn’t be reached either.
Another 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!" Judging from the current judgment, it is very likely that the murderer drove the vehicle and dumped the body, so 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 Haizhou City, it is not easy to find a taxi.
In the TV series, the system that can locate the other party's 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 carry out tour broadcast and query monitoring of real-time monitoring of important intersections. This is already the most advanced traffic control system in the country.
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 showed how seriously the murder case was taken by the Haizhou City Public Security Bureau. All field traffic police officers are mobilized to cover all major intersections!
“Nothing was found at the intersection of Youhao Road and Medical College Road!”
"The women's and children's road was not found!"
"Tian Tongtong is not found!" Reports came one after another in the traffic control command hall. 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!"
"The target vehicle was found at the intersection of Qingfeng Road and Youhao Road!"
"At the intersection of Qingfeng Road and Youhao Road, the target was found!" Zhang Yongzhi, who was directing the inspection in the hall, was shocked!
"well!"
"Don't act rashly, don't act rashly!"
"Report your location at any time and arrange surveillance on Qingfeng Road and Youhao Road for me!"
"Notify the criminal investigation detachment and ask them to arrest the person!" The traffic police detachment is good at finding cars, but arresting people requires professionals.
The other party is the suspected murderer of the corpse dismemberment case. Who knows if he has a weapon in his hand. Qin Yong got the news and went into battle in person.
Because just now, the Tianzhou City Criminal Investigation Detachment had 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. 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 him even more suspicious! 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 is it call?"
"Zhang...Zhang...Wei."
"Do you know why you were arrested?"
"Know...I...I killed someone..."
