Bloodstain Pattern Analysis is a very important discipline in criminal investigation studies.

Lu Chuan had studied it when he was in college.

However, the knowledge learned at school was relatively superficial, and without practical support, many theoretical concepts could not be applied in practice.

Moreover, in the resolution of actual cases, Bloodstain Pattern Analysis often requires some experimental support.

The skill card awarded to Lu Chuan by the system included most of the content.

The bloodstain from a drip can provide information on the volume of blood, the height from the bleeding point to the surface upon which it fell, based on the size and shape of the stain.

Combined with the extraction of blood DNA information, a substantial amount of information about the scene can be obtained.

For example, the bloodstain that Lu Chuan discovered appeared in a relatively regular circular shape, with fewer spines around it.

This indicates that the drop height of the bloodstain was low, and at the time of droplet fall, both the bleeding point and the landing point were in a relatively static state.

Retrieving the crime scene investigation kit, Lu Chuan took out a caliper to measure the shape and size of the bloodstain.

"If this bloodstain isn't from the victim, it's very likely related to the perpetrator. I'll try to analyze it."

By measuring the diameter and thickness of the circular drip stain and then performing a comparative analysis, the height of the bloodstain drop can be determined.

"Drip height... zero point seven two meters."

"The bloodstain fell freely with no angle deviation..."

For a crime scene investigation expert, bloodstains are of great significance in reconstructing the scene.

A single bloodstain shape can even map out the entire movement path of the perpetrator and victim at the scene.

With the data measurement and calculation quickly completed, Lu Chuan prepared to purify the genetic content from the bloodstain.

If DNA information can be extracted, it will greatly assist in solving the case.

As Lu Chuan was making discoveries, the action group's investigative work was also ongoing and had progressed significantly!

Happy Home District, Neighborhood Committee.

"Zhang Wei you mentioned is a taxi driver."

"He's a good person, quite honest, well-known to us, always willing to help; we're all familiar here, living in relocated housing, we used to be neighbors."

"It's just that he has a troublesome son..."

The neighborhood committee aunt was enthusiastic and cooperative with the police's work.

Zhang Hui asked while taking notes.

"What's troublesome about his son?"

Another aunt in a red down jacket poured Zhang Hui a cup of water: "Oh, what's troubling? It's just that he doesn't have a job. How many in our district have formal jobs?"

"Who doesn't have trouble in their family?"

"Has Zhang Wei shown any abnormalities in the past few days?"

"Abnormalities... Officer...has Zhang Wei done something?"

The aunt was evidently not working with the police for the first time, and with just a few questions, she knew that something might have happened to Zhang Wei.

However, it probably wasn't likely.

She saw Zhang Wei driving out this morning.

Zhang Hui waved his hand: "Nothing happened, something came up on Folk Street last night, and Zhang Wei drove past there. We have to check according to regulations."

Passed by?

The aunt nodded, her expression relaxing. If he just passed by, then there was no issue.

But instantly her expression turned tense: "Folk Street?"

"I heard over there... was there something dismembered..."

The aunt didn't finish speaking as her face turned pale.

"Ma'am, it's okay, we police are here, it's okay!"

All investigation interviews conducted by criminal police strictly stipulate that case details cannot be disclosed at will.

However, only those who have actually done visit work know that keeping confidentiality means others will also keep it.

Zhang Hui was an old hand at this, knowing neither to deny nor to say too much.

"Ma'am, tell us about Zhang Wei, has he shown any abnormalities recently?"

Indeed, Zhang Hui's words calmed the aunt down a bit: "Oh, you must hurry and solve this case..."

"Oh oh, that Zhang Wei didn't show any abnormalities. I even saw him this morning, he was sending his son on a trip."

"A trip? Did he leave too?"

"That I don't know, he just said early in the morning he was taking his son to the airport..."

Fifty-six vehicles were fully screened in less than an hour, fifty-four were accounted for.

The two remaining vehicles, one was Zhang Wei's taxi, which has yet to be located.

And Zhang Wei's phone could not be reached.

The other vehicle went to Tianzhou City early in the morning.

"Immediately contact the Tianzhou City Criminal Investigation Team, stop the vehicle on the highway at the exit!"

Based on current judgment, it's highly likely the perpetrator used the vehicle to dispose of the body, so there would inevitably be some traces left in the car.

Checking for these traces is not difficult.

"Also for Zhang Wei's taxi, notify the Traffic Police Team to find it at full strength!"

In the large Haizhou City, finding a taxi is not easy.

The kind of system on TV dramas where you input the license plate number and can locate the vehicle doesn't exist in reality.

The Haizhou City Traffic Police Team's road traffic monitoring system can display real-time traffic volumes at major intersections.

It can perform cyclical broadcasts and monitoring queries at key intersections.

This is already one of the more advanced traffic management systems domestically.

The so-called inputting a license plate number to query information can only find the vehicle registration information; as for querying location, it's impossible.

At this time, it highlights the importance placed on homicide cases by the Haizhou City Public Security Bureau.

All external police officers were dispatched, and all major intersections were covered!

"No discovery at the intersection of Friendship Road and Medical School Road!"

"No discovery on Women and Children Road!"

"No discovery on Tiantong Road!"

In the Traffic Management Command Hall, one report after another arose.

Such tasks were not new to the Traffic Police Team.

Over the past two years, Traffic Police Team leader Zhang Yongzhi had frequently organized similar inspection drills to improve emergency response speed.

Randomly pick a car, and everyone is mobilized!

"Report! Report!"

"Target vehicle discovered at the intersection of Qingfeng Road and Friendship Road!"

"Target found at the intersection of Qingfeng Road and Friendship Road!"

Zhang Yongzhi, who was commanding the patrol in the hall, was immensely energized!

"Good, good!"

"Do not act rashly, do not act rashly!"

"Report positions at any time, get me the Qingfeng Road and Friendship Road surveillance footage!"

"Notify the Criminal Investigation Team to arrest them!"

Finding a car is what the Traffic Police Team is good at, but arresting needs professionals.

The other party is suspected to be a dismemberment-case perpetrator; who knows if they have weapons.

Qin Yong personally took the charge upon receiving the news.

Because just now, Tianzhou City's Criminal Investigation Team had already returned the message.

The car stopped at the highway entrance had no issues.

Last night, there were only fifty-six cars passing by Folk Street.

Fifty-five of them had no issues, so the probability of the remaining one being involved is high.

Moreover, Zhang Wei was unreachable by phone, so the suspicion increased!

The arrest procedure went unexpectedly smoothly.

At the red light at the intersection of Qingfeng Road and Women and Children Road, Ren Qiang and others swarmed in, and the taxi trapped in traffic had nowhere to escape.

"What's your name?"

"Zhang... Zhang... Wei."

"Do you know why you're being arrested?"

"I do... I... I killed someone..."

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