The process of collecting blood stains was relatively simple, and Lu Chuan completed it quickly.
Although the crime occurred not long ago, the activity of the blood stains has long since disappeared, making it difficult to extract DNA information.
But there was more than just a similar dripping blood stain left at the crime scene.
There were similar blood stains found next to the sofa in the living room, on the edge of the coffee table and on the edge of the bedroom door.
"First do a blood type analysis and compare it with the deceased and Wang Hui."
Liu Guodong also attaches great importance to these dripping blood stains.
Not only does DNA information extraction take a long time, but the success rate cannot be guaranteed, but blood type verification is much simpler.
With blood type test strips, you can get the result in five minutes without using it.
"Master, look at these two blood stains."
Starting from the entrance door, Lu Chuan tried to reconstruct the crime scene based on the shape of blood stains.
What Wang Hui said, that he took the kitchen knife from the kitchen and chopped the victim from the sofa, is inconsistent with the flutter-like blood stains found on the entrance door.
So, what is real live action like?
Although Lu Chuan does not have the ability to go back in time, the blood stain shape can tell Lu Chuan some answers.
Liu Guodong came over and observed the blood on the ground.
"Of these two blood stains, one is a flutter-shaped blood stain, but the blood volume is very small. You see...the blood volume is only about two milliliters."
"This one is a splatter of blood, and the amount of bleeding is huge, at least 20 milliliters."
One was a flutter-like blood stain, and the other was a splatter-like blood stain.
Part of the two overlapped each other, forming a relatively complex bloodstain shape.
"Do you suspect 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 stab at the victim should have been from the entrance door, and then the victim retreated to the sofa area in the living room while resisting."
"During the process, the murderer probably chopped the victim again."
"The splattered blood on the ground was heavy, and it should have been the result of the victim being chopped."
"However, the amount of this flutter-shaped blood stain is small, and it partially overlaps with the victim's splattered blood stain. 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, so the possibility of the other party being injured is very high."
"Well," Liu Guodong nodded and agreed with Lu Chuan's analysis: "Collect it first and compare the blood types. We can verify whether the blood dripping on the entrance door belongs to the victim or the murderer."
"In addition, the victim at the crime scene resisted fiercely, and there may even have been... no, there must have been physical contact with the other party."
In the living room, the items on the coffee table were scattered on the floor, and many decorations fell down. It can be imagined that the resistance at that time was fierce.
"If Wang Hui was not the murderer, then the real murderer would not be able to clean up the traces he left at the scene."
"Hair and dander may be left behind. Let's collect them and go back for identification and analysis."
After setting the direction of their work, Lu Chuan and Liu Guodong began to conduct detailed on-site surveys again.
The investigation team of the Water District Criminal Investigation Brigade, Old Xu, did not do so meticulously last night.
After the incident last night, it was not someone else who called the police, but Wang Hui who took the initiative to call and surrender.
When the police arrived, Wang Hui was sitting in the living room, covered in blood, with the murderous kitchen knife on the coffee table.
Therefore, in a situation where the suspect has been caught, spot investigation becomes less important.
Lao Xu only did routine work and collected the murder weapon and some blood stains.
The work of the forensic doctor was very simple. When Wang Hui surrendered, the victim had just died.
The cause of death was also clear, the neck was almost chopped off, and then there were some routine superficial examinations.
The autopsy report was quickly handed over to Wang Yishan.
But things are different now. The current investigation needs to be re-conducted, not only the scene, but also the examination of the body must be re-conducted.
Of course, an autopsy would be unnecessary.
The cause of death, time of death and identity of the deceased were determined.
The forensic work was basically over, but Lu Chuan wanted to investigate the body surface of the corpse.
Especially the hands. When the victim resists the murderer, if he grabs the other person, it is very likely that evidence will be left in the fingernails.
If there is really a discovery, maybe the real culprit can be directly identified.
The criminal investigation detachment is currently investigating the laboratory.
Lu Chuan has completed the blood type analysis of the blood stains.
The result was as they had guessed. In addition to the victim's blood, there was indeed another person's blood at the crime scene.
Moreover, the blood type test determined that it was type A blood, but Wang Hui’s blood type was type AB blood.
From this point, it can be determined that Wang Hui is not the murderer.
As for the examination of the corpse, Lu Chuan conducted a surface inspection of the corpse. Unfortunately, nothing was found in the nails of the other party's hands.
But an investigation of the surveillance video yielded important findings.
"Yesterday evening, Wang Hui's father appeared in Dongyuan Community."
Liu Guodong began to pack up the instruments on the experimental table. The DNA information of the blood stains was extracted and purified using the instruments in the trace evidence laboratory, and was being analyzed.
It is estimated that the results will be available soon.
"But the person hasn't been found yet, so he probably ran away."
"Ran?"
Lu Chuan was a little surprised: "Wang Hui...is he taking the blame for his father?"
Lu Chuan had heard of a father taking the blame for his son, but he had never heard of a son taking the blame for his father.
"It's possible, let's wait for our results."
Lu Chuan nodded. Although Wang Hui's father has not been found yet, Wang Hui's DNA information has been extracted.
A paternity test between the two can identify the suspect.
Tonight, the two of them have to work overtime late.
There were a lot of hair, dander and other evidence collected at the crime scene.
It is necessary to collect DNA information from all these things.
But the crime scene was the home of Wang Hui and the victim, and there must be a lot of hair or dander belonging to them.
If it was really Wang Hui's father who killed someone, then the material he left behind would be relatively small.
In addition, Lu Chuan also collected some footprints.
Of course, since Wang Hui reported the crime at the crime scene, the scene was actually damaged a lot when he was arrested.
Especially the footprints on the ground are basically worthless 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 on the edge of the pool of blood, and it was precisely because of the existence of the pool of blood that this set of footprints were preserved.
the next morning.
Good news came from the Water District Criminal Investigation Brigade.
Wang Hui's father, Wang Dezhi, voluntarily surrendered.
"Take the blame for your father?"
Lao Bai and Yang Sen were busy with the detachment yesterday and did not go to the Water District Criminal Investigation Brigade.
Not much is known about the case.
When Lao Bai heard the case story relayed by Liu Guodong, his eyes widened: "The father killed his daughter-in-law, and his son took the blame? Isn't this too outrageous?"
