The process of collecting bloodstains was relatively simple, and Lu Chuan completed it quickly.

Although the crime hadn't happened long ago, the bloodstains had already lost their vitality, making DNA extraction more difficult.

However, in the crime scene, there wasn't just one similar droplet-shaped bloodstain left behind.

Similar bloodstains were found beside the living room sofa, the edge of the coffee table, and the edge of the bedroom door.

"Start with blood type analysis, and compare it with both the victim and Wang Hui."

Liu Guodong also took these droplet-shaped bloodstains seriously.

DNA extraction is time-consuming and the success rate cannot be guaranteed, but blood type verification is much simpler.

Using blood type test paper, you can get results in less than five minutes.

"Master, look at these two bloodstains."

Starting from the entrance, Lu Chuan attempted to reconstruct the crime scene based on the bloodstain patterns.

The story Wang Hui told, that he grabbed a kitchen knife from the kitchen and attacked the victim from the sofa, did not match the thrown pattern bloodstains found at the entrance.

So, what was the real action on the scene?

Although Lu Chuan couldn't go back in time, the bloodstain patterns could provide some answers.

Liu Guodong came closer to observe the bloodstains on the ground.

"These two bloodstains, one is a thrown pattern with a very small amount of blood, you see... about only two milliliters."

"This one is a splatter pattern with a large amount of blood, at least twenty milliliters."

One thrown pattern and one splatter pattern.

The two partially overlapped, forming a complex bloodstain pattern.

"Are you suspecting one belongs to the killer and the other to the victim?"

Lu Chuan nodded and pointed towards the entrance: "Now it can be basically confirmed that the killer's first chop at the victim started from the entrance, and then the victim resisted while retreating to the sofa area of the living room."

"During this process, the killer likely chopped the victim again."

"The large blood volume of the splatter pattern on the ground should be from the victim's wound after being chopped."

"However, the small blood volume of this thrown pattern, which partially overlaps with the victim's splatter bloodstains, is very likely left by the killer."

"After all, the killer seemingly left droplet-shaped bloodstains at the entrance, indicating a high probability of injury."

"Hmm," Liu Guodong nodded in agreement with Lu Chuan's analysis: "First, collect it and perform blood type comparison to verify if the droplet-shaped bloodstain at the entrance belongs to the victim or the killer."

"Also, the victim put up fierce resistance at the crime scene, and there might have been... no, there must have been physical contact with the other party."

In the living room, items on the coffee table were scattered on the ground, and many decorative items had fallen, indicating that the resistance at the time was quite fierce.

"If Wang Hui is not the murderer, then the real murderer can't possibly clean up all traces of himself at the scene."

"Hair, skin cells, could all have been left—let's collect everything and run a forensic analysis."

Having set the direction of work, Lu Chuan and Liu Guodong began a detailed re-examination of the scene.

Old Xu from the Water District's Criminal Investigation Team did not conduct such a detailed investigation last night.

After the crime occurred last night, it wasn't someone else who reported it, but Wang Hui who called in to self-report.

When the police arrived, Wang Hui was sitting in the living room, covered in blood, with the murder weapon—a kitchen knife—placed on the coffee table.

Therefore, with a suspect already apprehended, the crime scene investigation seemed less important.

Old Xu just did a routine job, collecting the murder weapon and part of the bloodstains.

The work on the forensic doctor's side was very simple. When Wang Hui turned himself in, the victim had just died.

The cause of death was clear, the victim's neck was nearly severed, followed by some routine surface examinations.

The autopsy report was quickly handed to Wang Yishan.

But now it's different, the site examination needs to be redone, not just the scene but also the body inspection.

Of course, an autopsy is unnecessary.

The cause of death, time of death, and identity of the deceased have been determined.

The forensic doctor's work is basically complete, but Lu Chuan needs to examine the body surface.

Especially the hands, as the victim may have caught the killer when resisting, potentially leaving evidence under the nails.

If something is truly discovered, it might directly lead to the identification of the real murderer.

Criminal Investigation Team crime scene investigation laboratory.

Lu Chuan has completed the blood type analysis of the bloodstains.

The results were consistent with their suspicions, besides the victim's bloodstains on the crime scene, there was indeed another person's bloodstains.

And blood type testing identified it as type A, whereas Wang Hui's blood type is AB.

This point confirms that Wang Hui is not the murderer.

As for the body examination, Lu Chuan conducted a surface inspection, and to his disappointment, no significant findings were made under the fingernails.

However, there was a significant discovery from the surveillance video investigation.

"Last evening, Wang Hui's father was seen at East Garden District."

Liu Guodong started tidying the instruments on the lab bench as the DNA information extracted from the bloodstains was being analyzed using the instruments in the trace evidence laboratory.

The results should be available soon.

"However, the person hasn't been found, there's a high possibility he fled."

"Fled?"

Lu Chuan was a bit surprised: "Wang Hui... is taking the blame for his father?"

Lu Chuan had heard of a father taking the blame for his son, but never of a son taking the blame for his father.

"It's possible, let's wait for our result."

Lu Chuan nodded, although Wang Hui's father hasn't been found yet, Wang Hui's DNA information has already been extracted.

A paternity test between the two could lock down the suspect.

Tonight, the two had to work late.

Many pieces of evidence such as hair and skin cells were collected from the crime scene.

All of these need DNA information extraction.

But the crime scene was Wang Hui and the victim's home, so there would be a lot of their hair or skin cells.

If it was indeed Wang Hui's father who committed the murder, the substances he left behind would be relatively less.

In addition, Lu Chuan had also collected some footprints.

Of course, since Wang Hui reported the crime on the scene, the arrest process had considerably disrupted the scene.

Especially the footprints on the ground, which basically had no collectible value left.

Lu Chuan collected two sets of footprints at the edge of the blood pool in the bedroom.

Part of the footprints happened to print on the edge of the blood pool, and it was precisely because of the blood pool's presence that this set of footprints was preserved.

The next morning.

The Water District's Criminal Investigation Team brought good news.

Wang Hui's father, Wang Dezhi, turned himself in.

"Taking the blame for his father?"

Old Bai and Yang Sen were busy with matters concerning the team yesterday and did not go to the Water District's Criminal Investigation Team.

They weren't very familiar with the case.

Old Bai's eyes widened when he heard Liu Guodong's recap of the case: "The father killed the daughter-in-law, and the son took the blame? That's just outrageous!"

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