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

Although the crime has not been committed for a long time, the activity of the blood stains has long disappeared, and it will be difficult to extract DNA information.

But there was not just a similar dripping blood stain left at the scene of the crime.

Next to the sofa in the living room, on the edge of the coffee table and on the edge of the bedroom door, similar bloodstains were found.

"Do a blood group analysis first, and compare it with the deceased and Wang Hui."

Liu Guodong also attaches great importance to these dripping bloodstains.

DNA information extraction takes a long time and the success rate is not guaranteed, but blood group verification is much simpler.

With a blood group test strip, you can get the result in less than five minutes.

"Master, look at these two bloodstains."

From the entrance door, Lu Chuan tried to reconstruct the scene of the crime according to the shape of the bloodstains.

What Wang Hui said about taking a kitchen knife from the kitchen and slashing the victim from the sofa did not match the throwing blood stains found at the entrance door.

So, what is the real live action like?

Although Lu Chuan does not have the ability to go back in time, the bloodstain form can tell Lu Chuan some answers.

Liu Guodong leaned over and observed the blood stains on the ground.

"These two blood stains, one is a throwing blood stain, but the amount of blood is very small, you see...... It's only about two milliliters of blood."

"This one is a splattery of blood, and the bleeding is very large, at least twenty milliliters."

One is a splattering bloodstain, and the other is a splattering bloodstain.

Some of the two overlap each other, forming a more complex bloodstain pattern.

"Do you suspect that one is the murderer and the other is the victim?"

Lu Chuan nodded and pointed in the direction of the entrance door: "Now it is basically certain that the murderer's first slashing of the victim should have started from the entrance door, and then the victim retreated to the sofa area in the living room while resisting."

"In the process, the murderer should have slashed the victim again."

"The splattered blood stains on the ground are bleeding a lot, and they should be splattered from the victim's wound after being slashed."

"However, this throwing bloodstain has a small amount of bleeding, and it partially overlaps with the victim's splattered bloodstains, so it is very likely that it was left by the murderer."

"After all, the murderer is suspected of leaving dripping blood stains at the door, and there is a high probability that the other party was injured."

"Well," Liu Guodong nodded in agreement with Lu Chuan's analysis: "Collect it first and compare the blood type, you can verify whether the dripping bloodstains on the entrance door belong to the victim or the murderer."

"In addition, the victim at the scene of the crime resisted violently, and there may even be ...... with the other party No, there must have been physical contact."

In the living room, the items on the coffee table were scattered on the ground, and many decorations fell, so it is conceivable that the resistance at that time was fierce.

"If Wang Hui is not the murderer, then the real murderer will not be able to clean up the traces he left at the scene."

"Hair and dander may be left, let's collect them and go back for identification and analysis."

After setting the direction of work, Lu Chuan and Liu Guodong began to conduct a detailed survey of the site again.

Lao Xu, the current investigator of the Criminal Investigation Brigade of the Water District, did not do so meticulously last night.

After the incident last night, it was not others who called the police, but Wang Hui took the initiative to call and surrender.

When the police came, Wang Hui was sitting in the living room, covered in blood, with a murderous kitchen knife on the coffee table.

Therefore, in the case where the suspect has already been caught, the investigation is not so important.

Lao Xu only did routine work, collecting the murder weapon and some blood stains.

The work of the forensic doctor is very simple, when Wang Hui surrendered, the victim had just died.

The cause of death is also clear, the neck was almost cut off, and then some routine superficial examinations followed.

The autopsy report was quickly handed over to Wang Yishan.

But now it is different, and the current investigation has to be re-conducted, not only at the scene, but also for the examination of the body.

Of course, an autopsy would not be necessary.

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

The forensic doctor's work is basically over, but Lu Chuan has to conduct an examination of the body surface.

Especially with both hands, when the victim resists the murderer, if he catches the other party, it is very likely to leave evidence in the nails.

If there is really a discovery, maybe the real culprit can be directly locked.

The criminal investigation detachment is investigating the laboratory.

Lu Chuan has completed the blood grouping analysis of the blood stains.

As they suspected, in addition to the victim's bloodstains, there were indeed other people's bloodstains at the scene of the crime.

And after the blood group test, it was determined that it was blood type A, but Wang Hui's blood type was blood type AB.

From this point, it can be determined that Wang Hui is not the murderer.

As for the examination of the corpse, Lu Chuan did an autopsy, but unfortunately, nothing was found in the fingernails of the other party's hands.

But the surveillance video investigation has made important discoveries.

"Yesterday evening, Wang Hui's father appeared in the Dongyuan community."

Liu Guodong began to pack up the instruments on the experimental table, extracting the DNA information of the bloodstains, and after purifying it with the instruments in the trace evidence laboratory, he was doing analysis.

It is estimated that the results will be available soon.

"But the person hasn't been found yet, so it's very likely that he has escaped."

"Ran away?"

Lu Chuan was a little surprised: "Wang Hui...... Is it for his father?"

Lu Chuan had heard about the father's confession to his son, but Lu Chuan had never heard of the son's confession to his father.

"It's possible, wait for our results."

Lu Chuan nodded, although Wang Hui's father has not been found, Wang Hui's own DNA information has been extracted.

Both do a paternity test to lock the suspect.

Tonight, the two of them have to work overtime late.

More evidence such as hair and dander was collected at the scene of the crime.

DNA information is collected for all of these things.

But the scene of the crime is the home of Wang Hui and the victim, and there must be a lot of hair or dander belonging to the two of them.

If it was really Wang Hui's father who killed someone, then he would have left relatively less material.

In addition, Lu Chuan also collected some footprints.

Of course, because Wang Hui reported the crime at the scene of the crime, when he was arrested, the scene was actually destroyed a lot.

In particular, the footprints on the ground are basically of no value to collect.

What Lu Chuan collected were two sets of footprints on the edge of a pool of blood in the bedroom.

Some of the footprints happened to be imprinted on the edge of the pool of blood, and it was precisely because of the presence of the pool of blood that this group of footprints was preserved.

The next morning.

There was good news from the Criminal Investigation Brigade of the Water District.

Wang Hui's father, Wang Dezhi, voluntarily surrendered.

"Father's sin?"

Lao Bai and Yang Sen were busy with the detachment's side yesterday and did not go to the Water District Criminal Investigation Brigade.

Not much is known about the case.

Lao Bai heard the case relayed by Liu Guodong, and his eyes widened: "The father killed his daughter-in-law, and the son is guilty? That's outrageous, isn't it?"