Murder cases in real life are different from those in TV series.
Murder scenes are often more bloody, so bloody that most people will vomit just looking at them, and ordinary people may faint when they see a pool of blood.
Not only that, but unlike in the TV series, where the murderer is very cunning and plans for three or even ten years before committing the murder, in reality there are only a very small number of people who plan to kill, and most of them kill with passion.
If you disagree, it is a reality to draw swords against each other.
Therefore, after many murders occur, the murderer can mostly be identified immediately.
Then there will be arrests, or some suspects will turn themselves in.
Minato's case is a typical case of passion killing.
The crime scene was at the deceased's home, and there was a conflict between the murderer and the murderer.
"The couple had a quarrel, and the husband was so anxious that he took out a kitchen knife from the kitchen and chased and chopped him in the living room, all the way to the bedroom."
Wang Yishan, captain of the Water District Criminal Investigation Brigade, was briefing Liu Guodong and Lu Chuan on the circumstances of the case.
"Have the physical evidence collected at the scene been sent away?"
Generally speaking, Liu Guodong doesn't like taking on secondary site survey work.
After all, no one knows how the last field survey went.
For example, the DNA collection materials were not in place, the clarity of the wiped fingerprints was good, and there were also traces left by the criminal police officers who made the initial investigation, etc.
However, the Water District Criminal Investigation Brigade asked the detachment for help, and it was difficult to shirk it. The current investigator here was also a colleague Liu Guodong had known for a long time, so he brought Lu Chuan over to take a look.
"I sent it back overnight yesterday. Lao Xu originally wanted to finish analyzing the physical evidence overnight, but he didn't expect that he had pancreatitis..."
Although Liu Guodong has never had pancreatitis, he knows that this disease is quite painful and can be life-threatening if not treated in time.
"In this way, now that the murderer has been caught, Lao Xu has also conducted the first survey at the scene. Let's walk through it again to see if there is anything left behind. If not, the main task is to analyze the physical evidence collected by Lao Xu. superior."
Liu Guodong glanced around and discussed with Wang Yishan.
"Old Liu, you are an expert in this area. You and Teacher Lu are busy first while I return to the team and watch the interrogation."
Wang Yishan and Liu Guodong have known each other for more than ten years, which is one of the reasons why Liu Guodong came to the Water District Criminal Investigation Brigade to help.
Otherwise, Liu Guodong could shirk it and ask them to ask other criminal investigation teams for help.
The Criminal Investigation Detachment is the superior unit, so this can still be rejected.
While the two were chatting, Lu Chuan had already started working.
The scene was not complicated, except that the deceased bled excessively in the bedroom after being chopped down by her husband, and the entire bed was soaked in blood.
Many items in the living room fell to the floor, and the scene was a bit messy.
The murderer voluntarily surrendered after the murder, and the preliminary interrogation results were completed last night.
Wang Yishan just briefly described the process of the murderer's crime.
As for the reason, it is very simple, it is the conflict between husband and wife, over trivial matters that happened more than ten or twenty years ago.
"Check the physical evidence list. If there are no major problems, then withdraw it."
Liu Guodong has already obtained the list of physical evidence compiled by Lao Xu last night.
Walk through the scene, and if nothing special is found, you can go back and do physical evidence analysis.
In fact, there is nothing too troublesome. The main thing is to detect the murder weapon.
For example, fingerprints, blood stains, and the match between the murder weapon and the wound of the deceased, etc. After confirming that there are no problems, the evidence can be locked.
Lu Chuan took the list and checked it one by one starting from the moment he entered the door.
Old Xu, a field surveyor in the water area, is still a professional. Lu Chuan has met him twice. He is in his forties. He used to be a front-line criminal police officer and switched to a field survey professional more than ten years ago.
There is no systematic training, but I have my own set of methods.
And judging from the marking serial numbers on site, Lao Xu’s on-site survey was very detailed.
Start from entering and work your way in step by step.
Lu Chuan is now on the road that brought Lao Xu here.
Walk through it again to make sure nothing is missing, and the second survey is complete.
Most crime scenes are actually investigated more than once.
This is especially true for some major cases, especially murder cases.
However, not everyone can enter the scene casually, and a single criminal police officer is not allowed.
Any criminal police officer, whether a criminal police officer handling a case or a technical criminal police officer on site, needs to complete the approval procedures before entering the scene.
The fighting at the scene should be quite intense.
There were blood stains on the walls, floor, and furniture.
Starting from the entrance door, the blood stains are intermittent...
Um?
Lu Chuan was suddenly stunned.
He turned around and looked at the blood stains on the door frame of the entrance door.
The blood stains were in a parabola shape, thrown from the door to the inside.
Lu Chuan, who has mastered intermediate bloodstain morphological analysis, can even simulate in his mind the trajectory of bloodstains, the angle at which the murderer wields the murder weapon, and even the rough force used by the other party.
Bloodstain analysis is the most common piece of evidence found at most murder scenes.
In China, most murders are caused by cold weapons.
Common ones are kitchen knives, wooden sticks, axes, wine bottles, etc.
There are also killings with bare hands, most of which result in death through suffocation.
No matter which one, most will leave blood stains at the crime scene.
Needless to say, killing people with swords, guns, clubs and axes will definitely lead to blood.
Killing with bare hands, unless the person being killed has no ability to resist, such as being tied up or stunned.
Otherwise, the person who was killed would definitely resist.
As the saying goes, rabbits bite when they are anxious. No matter how weak the victim is, when his life is threatened, he can at least scratch the murderer's hand, right?
In some homicide cases, the killer's epidermal tissue was extracted from the cracks in the victim's fingernails. This is the reason.
Of course, some murderers will put on gloves before strangling someone, or even deliberately wear long-sleeved clothes to cover their arms. This is something only a murderer who is very experienced or has planned the murder can think of.
As for the current scene, it is an excellent case of blood stain analysis.
There are dripping bloodstains, columnar bloodstains, fluttering bloodstains, splattering bloodstains, and pools of blood on the bed.
What puzzled Lu Chuan was the blood stain on the edge of the entrance door where the wall and door frame joined.
This is a thrown blood stain. From the changes in the thickness of the parabola, it can be judged that the blood stain spreads from the direction of the entrance door, and then adheres to the joint between the wall and the entrance door.
From the changes in burrs on the edge of the bloodstain and the direction in which the bloodstain extends, we can determine where the murderer and the victim were standing at the time, as well as the direction in which the knife was swung.
In addition, there was an oval drop of blood on the ground in front of this blood stain.
From the shape and size of the drip-shaped blood stain, the dripping height of the source of the blood stain can be measured.
The combination of flutter-like blood stains and drip-like blood stains made Lu Chuan a little confused.
And this doubt is that the scene dynamics shown in the blood stains are different from what Wang Yishan just said...
no the same!
