Chapter 306

"I confirmed with the husband of the deceased that this family's smart home can not only control the lights, but also turn on the bathroom heater and exhaust air in one line. In addition, the air conditioning and fresh air system can also be controlled. The shower head and bathtub are also controlled, including water inlet and exhaust. Release water

Captain Ma returned to the scene. While talking about the situation, he couldn't help complaining: "How could someone put all their home appliances online? Not only did they let others control them, but they also had to spend more money themselves?"

"It should be very convenient."

With one-touch hot water, people are sitting on the subway, and the bathtub in the bathroom has begun to store water. When they get home, they can take a bath directly. Isn’t it wonderful to think about it? Tang Jia was the first to stand up and object. This was what she was willing to do.

Captain Ma curled his lips: "As for fighting for a few minutes?"

Wan Baoming said quickly: "I'll call the technician over. Then we'll see if we can find someone who has used this software. If the other party just used it normally, there should be traces left."

Jiang Yuan listened to several people talking and still scanned the bathroom silently. Regardless of whether the murderer used this system or not, he had definitely done the murder and faked the suicide scene, and he had to do it in this bathroom.

In this way, the probability of leaving traces is greatly increased. Moreover, Jiang Yuan did not believe that anyone could cover everything. This person spent a lot of effort on forging the scene, but he may not have enough time and energy to eliminate the traces.

Many people have huge misunderstandings in thinking and doing things. It's like saying that if you want to kill and hang a husky alone, you have to pretend that you hanged yourself. How much effort and time does it take? What about cleaning the bathroom? Many people may have never tried to clean a bathroom in their lives. If you want to clean every corner of the bathroom without leaving any trace, how much time and energy will it cost? In the middle of the game, I fell down and broke my elbow, which had to be cleaned again. Some willful players might just give up.

If you give up, give up, see you on the execution ground.

The above are still murderers who know how to do things. Some murderers have obvious shortcomings in life. It is even more difficult to kill people and remove traces.

For example, some people don't know how to tie ropes, and they can't fix the buttons for hanging. They lift a corpse weighing more than 100 kilograms, and they are exhausted and sweaty. They have to be careful not to contaminate the clothes of the corpse. Then, there is a chirp. , the rope opened, and the body fell to the ground. How angry and difficult! In addition, if the murderer wants to fake the scene, many methods will not be available.

For example, some cleaning products can indeed destroy DNA, but they are not commonly used cleaning products, or the victim did not buy them at home, so the murderer may have no choice but to risk letting his DNA stay. This is a risk that has to be faced while gaining benefits from forging the scene.

Jiang Yuan is currently blocking the murderer from cleaning up the scene.

With his LV4 crime scene investigation skills, he can easily find problems in crime scenes that have been investigated by LV2.

An ordinary murderer, if he has not received professional training, why would he not leave any traces?

Of course, today's smart people can wear gloves, but there is a high probability that there will be no fingerprints. Jiang Yuan swept away a lot of the dander and hair at the scene. Especially in the sewers and wash basins, short hair was found, and water stains were also found.

The deceased had long hair, and his daughter also had long hair and was staying at school. The husband of the deceased was semi-bald, and the remaining hair was relatively long.

The origin of this short hair is more thought-provoking.

Jiang Yuan carefully took out a number of short hairs and put them into evidence bags respectively. He also checked various toiletries, and then wiped a box of cotton swabs on various suspicious areas, feeling a little better.

Compared with the identification of the time of death, the acquisition of this kind of evidence seems to be more real.

"That's almost it." Jiang Yuan put the towels and other items directly into the large evidence bag.

By solving the murder case, there is no need to save money for the criminal police detachment.

Killing is actually quite tiring. For example, kill a 100-pound husky and then hang it up to pretend to commit suicide.

guard

The environment of the living room is closed, so it is normal to break out in a sweat. If the murderer wiped his sweat, the towel might have the murderer's DNA on it. If the murderer had allowed his sweat to drip, the water stains on the floor just wiped might contain the murderer's DNA.

If the murderer washed directly with water, then there might be his DNA in the sink just wiped.

The great thing about DNA is that it is in extremely small amounts. In an environment like the bathroom, unless cleaning and disinfecting items are used properly, DNA may still remain even if it is rinsed with water many times.

Unfortunately, in order to fake the suicide scene, the murderer could not use unconventional cleaning agents, which left the possibility of leaving behind DNA.

This is the asymmetric battle between the murderer and the police.

If the killer chooses to fake the scene, he cannot eliminate the evidence. If the killer chooses to eliminate evidence, he faces the risk of omissions, as well as the hassle and professional requirements of carrying various cleaning supplies. Likewise, he faces the risk of omission.

Of course, he can also choose not to deal with the scene and use the shortest contact time and contact method.

But murderers often kill to vent their emotions. Since they cannot control their emotions, they may not be able to maintain considerable discipline when killing.

On the other hand, the shortest contact time and contact method also have to face street cameras, possible witnesses, and the resistance of the victim.

Just like the 513 door-opening stabbing case that Jiang Yuan had done before, it was already a short-term contact case with luck, but after two or three layers of window paper were broken, there was still a lot of evidence left.

However, if Jiang Yuan had not appeared to identify the time of death of the body, making the husband the first suspect, the investigators would probably not have desperately collected evidence.

Because the husband's DNA must be all over the bathroom, as for whether there is other people's DNA, it is usually not investigated.

Whose family doesn't come to two people and leave some sweat beads in the bathroom. Several investigators of the Criminal Police Detachment continued to be busy in the living room and bedroom, hoping to collect something else.

Murder cases are different from other cases. They usually have stronger motives.

Without sufficient motives and not being antisocial, people will not easily kill people.

And in cases of fake scenes, once the veil of fakery is lifted, the content usually becomes straightforward.

Just like everyone was staring at the husband of the deceased at the beginning, if the deceased was not killed by her husband, then the murderer must have a strong relationship with her.

In the busy time, the technicians of the network security brigade arrived.

Similar to the investigation box of the on-site investigation or the forensic investigation box of the forensic doctor, the network technicians also have their own investigation boxes, which must have equipment for "violent" acquisition of data, usually used to deal with mobile phones, and other smart devices, naturally, can't escape.

Jiang Yuan and others went out of the door and waited.

The victim's family and several neighbors were taken to the case handling center for record.

The corridor was quite quiet for a while. Wan Baoming looked around at this time and said: "If it's not a smart home, there should be people hiding in the ventilation ducts and the like inside."

"Hide in the corner, wait until we leave before jumping down?" Captain Ma was quite cooperative.

"Maybe the police were called too quickly."

"By the way, the deceased's husband came home faster than usual this time."

"It's no use coming back quickly, and it's rare to call the neighbors without saving people first."

Several people were muttering at the door.

Soon, the technician came out, looked at the records in his hand, and said: "Someone did turn on the bathroom heater light and shower head at 10:21, and the air conditioner was turned on. At 11:20, the shower head was turned off and the bathtub was drained. At 11:25, the exhaust fan was turned on, the air supply of the fresh air system was adjusted, and the air conditioner was changed to cooling.

At 11:35, the bathroom heater, exhaust fan and air conditioner were turned off. "Captain Ma's face was solemn: "Someone really used this thing."

Wan Baoming also looked grim, looking at the technician: "Can you find out who controlled it?"

"You can only check it after you go back. If the other party is on guard, you may not be able to find it." The technician said.

Tang Jia said at this time: "Can we check who ifi has connected to before? The records on the router and so on."

The technician said: "Yes, what are you looking for?"

"There must be a reason for murder. If it is not a property dispute, is it possible that this murder is due to emotional problems?" Tang Jia said in a low voice: "The murderer knows the situation of the deceased's home very well. At least he must have been here to know that there are these smart homes..."

"Okay, let's check it according to this idea." Captain Ma nodded immediately, and then said: "Find the person and compare it with the DNA found at the scene to see if it can be matched."

--Go to check