Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 156
Office of the Captain.

Qin Yong is crossing his legs, holding a small teapot, humming a popular song from 30 years ago.

Murder is not terrible, as long as it can solve the case, it is a good policeman.

From working as a front-line criminal policeman to now, Qin Yong has experienced thousands of cases, large and small.

There are almost ten or twenty murder cases every year.

It can be said that he was trained in the mountains of corpses and seas of blood.

Facing the murder case, Qin Yong already had a sense of normalcy.

When handling a case, you should be nervous and work overtime. Now that the case is solved, it's time to relax.

In fact, it makes sense that being a policeman does not lead to a long life. When a case comes, the adrenaline rushes soaring, and staying up for days and nights is commonplace.

The case is over, and the whole person seems to be paralyzed.

Qin Yong, leaning on the back of the chair, was humming a ditty, squinting his eyes and was about to fall asleep.

I will report the case to the bureau tomorrow, and I can get off work at noon...

buzzing.

The vibrating sound of the mobile phone woke up Qin Yong who was just about to fall asleep.

"Old Liu, are you done with the work at the scene?"

The scene of the first crime is the most concerned part of all murder cases.

"It's almost busy here, but I found a new situation."

"Oh? What's the situation?"

"Zhang Wei...may not be the murderer!"

Not the murderer?

Liu Guodong's words were like an ice pick, piercing Qin Yong's heart.

The hazy drowsiness just now dissipated in an instant.

Jumping up from the chair, Qin Yong raised his voice an octave: "What did you just say?"

Liu Guodong's voice was low: "Zhang Wei, it might not be the murderer."

Liu Guodong, who was far away in the No. [-] cold storage, was wrapped in a coat at the moment, with cold snot running down his nose.

The work on site is nearing completion and will be over soon.

After collecting the evidence at the scene, you can sleep peacefully when you go back.

As a result, a phone call from Lu Chuan meant that all work might have to be restarted.

"Did anything be found at the scene?"

Qin Yong's first reaction was what evidence Liu Guodong found at the scene.

But Zhang Wei has already laid down, and the crime history he explained is also very detailed, it doesn't seem like he is taking the blame for someone else.

"Nothing was found here at the scene, it was Lu Chuan's side."

"He collected a drop-shaped blood stain from the fragments of the corpse. The blood type did not match the blood type of the deceased. It is guessed that it should be left by the murderer."

"Before we caught Zhang Wei, Lu Chuan did a blood analysis on the dripping blood."

"But after Lu Chuan collected blood from Zhang Wei just now, he found that his blood type is A blood type, while the blood dripping blood type is AB type."

"Zhang Wei, it is very likely that he is not the murderer!"

After hanging up the phone, Qin Yong put on his coat and went straight to the current survey laboratory.

When Liu Guodong called Qin Yong to report, Lu Chuan was collecting DNA information from the blood on the corpse.

From a technical point of view, Lu Chuan only provided evidence of the current exploration discovery.

As for who the evidence points to, that's not what Lu Chuan cares about.

Therefore, after confirming that Zhang Wei's blood type did not match the blood type of the dripping blood, Lu Chuan focused on extracting the blood DNA information.

When Qin Yong came, the DNA information of the dripping blood had just been extracted.

"Xiao Lu, Lao Liu said that you have a new discovery here?"

Looking up and seeing Qin Yong coming in, Lu Chuan nodded and continued to operate the computer.

Compared with the previous few months, Lu Chuan is no longer a cutie who always salutes everyone.

The winner of first-class meritorious service allowed Lu Chuan to accumulate enough status.

Now, no one is talking about the time when Lu Chuan joined the police.

The entire criminal investigation team knew that Lu Chuan was an expert in fingerprint identification and analysis.

This is one of the most sought-after technical abilities.

Maybe one day I have a fingerprint in my hand and need help from others.

"Captain Qin, I found something."

Lu Chuan explained the inconsistency of the blood type comparison in detail.

"According to Zhang Wei, he killed Wang Guizhi alone, and then drove a taxi alone to dump the body."

"In this case, it is impossible for Wang Guizhi's body to be stained with blood from anyone other than herself and Zhang Wei."

"Where did the drop of blood come from?"

A drop of blood is insignificant, but sometimes it is enough to overturn the entire case.

When police handle a case, what they pay attention to is not logical coherence.

Logic makes sense, but reality doesn't necessarily make sense.

What happened in reality is not all logical.

For example, Zhang Wei's motive for the murder, according to his account, was because the two quarreled, and he killed him.

This is obviously illogical.

But reality can happen.

Therefore, in any case investigation, logical reasoning is basically an auxiliary analysis.

Ultimately, what needs to be looked at must be evidence.

Witnesses and physical evidence must be complete, and the chain of evidence must be complete, and at the same time there must be no contradictions.

According to Zhang Wei's account, the murder motive, murder weapon, crime scene, process and technique of dumping the body, etc., can all form a closed loop.

However, this drop of blood on the corpse caused a loophole in the closed loop.

Of course Qin Yong knew what Lu Chuan meant.

The source of this drop of blood must be found.

"How about DNA information comparison?"

Lu Chuan has just entered the information into the system and is comparing it.

When Qin Yong asked, the result just came out.

"Ok?"

After glancing at the report, Lu Chuan was slightly taken aback: "The information comes from the same source?"

"What information is from the same source?"

Qin Yong saw the results of the DNA comparison and took a step forward.

"Oh," Lu Chuan clicked the mouse, and printed the report: "When I collected Zhang Wei's blood, I also collected his hair and did a DNA information test."

"The blood stains on Wang Guizhi's body showed that it was of the same origin as Zhang Wei's DNA information, and there was a parent-child relationship between the two."

Parent-child relationship?

"When Zhang Wei killed someone, his son was there?"

Qin Yong immediately understood what was going on.

"Even... Is it possible that the murderer wasn't Zhang Wei at all, but his son?"

"Zhang Wei...is taking the blame for his son?"

Lu Chuan shook his head, these two conclusions cannot be distinguished by technology.

But since there is this clue, it is not difficult to track it down.

Zhang Wei said that he had been driving before the murder, and he could find out after investigating the trajectory.

Moreover, according to the preliminary investigation results, Wang Guizhi took the bus home after get off work.

Why did she get off the bus and take a taxi halfway? After checking, she will understand everything.

After taking the report, Qin Yong left the current survey laboratory, and made a phone call while walking: "Zhang Hui, Zhang Wei will be interrogated again!"

Lu Chuan packed up the instruments and the remaining test materials, put on his coat and left.

The on-site work at the No. [-] cold storage has not yet been completed, and Lu Chuan can still catch up with the finishing touches.

trial room.

Facing the DNA information comparison report in Zhang Hui's hand, Zhang Wei didn't say a word.

"Zhang Wei, did you kill the man?"

"Don't think that if you don't say anything, there is nothing we can do."

"We are already looking for the person who took your car three nights ago. Whether it was you or your son who drove the car that day, we will know if you ask."

At the same time as Zhang Wei's second trial, the arrest of Zhang Wei's son Zhang Xuanrong was also carried out simultaneously.

(End of this chapter)