Chapter 134： Doubtful

Fast forward the video.

"Look at the fishing line. The fishing line used by the murderer was taken directly from the drawer of the TV cabinet in the living room."

The scissors used by the murderer were also taken out from the drawer of the coffee table.

"This shows that, on the one hand, the murderer knows Zhao Mingwei's family very well, and the possibility of acquaintances committing the crime is very high."

"The first group will focus on investigating the relatives of Zhao Mingwei's family, especially the whereabouts of Zhao Dezhi's adopted son, Zhao Danyang!"

Yes, judging from the data, Zhao Dezhi has an adopted son in his family.

Zhao Danyang.

The whereabouts are currently unknown, and there is a major suspicion of committing the crime.

"The second group will focus on investigating the packaging bags found in the trash cans in the Zhao family's kitchen."

The packaging bag was discarded by the murderer on the way.

It originally contained items such as wax-sealed steaks brought by the murderer.

From the point of view of the video, the murderer fixed the mobile phone on the forehead at that time, and broadcast the whole process live from the first point of view.

However, the mobile phone and WeChat account used for the live broadcast belonged to Zhao Mingwei himself.

"The font printed on the packaging bag is from a supermarket called I Love My Home, and the second group will try their best to track down the steak sales records of this supermarket."

"The third group, check the clothes on the deceased."

The clothes of the four victims fit very well. According to the live video, the murderer took it out of the bag he brought with him.

The four garments are of very good material, neatly ironed and clearly well groomed.

Although the brand labels on the clothes have been removed by the murderer, from the perspective of fabrics and tailoring, they are definitely designer clothes.

"The third group, we must focus on investigating the source of the clothes on the deceased, and strive to find out the purchasers and purchase channels."

"In addition, collect the information of 32 people watching the live broadcast."

"The fourth group will focus on checking the knife and fork in Ding Suxi's hand."

Click!

The photo is projected again.

and gradually enlarge.

"The knife and fork in Ding Suxi's hand is not an ordinary western food knife and fork. Pay attention to the position of the handle of the knife and fork. It is printed with a special rose pattern."

"General inferior knife and fork will not have such clear printed steel patterns."

"The rose pattern is either a brand of knife and fork, or a unique logo of a western restaurant."

"I want you to find out the source of this knife and fork in the shortest time possible."

"Also, pay attention to the autopsy reports of the four bodies."

"The fifth group, check all the videos near Zhao Mingwei's house, and try to find out the suspicious people."

The house where the four Zhao Mingwei died is the property of Zhao Dezhi.

Zhao Mingwei and Ding Suxi don't usually live here.

According to the information that has been found in Hulu City, Zhao Mingwei lives in the neighborhood next door.

Ding Suxi lives with her parents.

He did not live with Zhao Mingwei.

Judging from the situation at the scene, it should have been four people having a dinner together that afternoon, which resulted in carbon monoxide poisoning.

The general work arrangement was completed, only Qin Chuan and Chen Yan were left.

Who is Qin Chuan, an old detective.

Seeing Chen Yan's expression, he knew that Chen Yan still had work to do.

"Chen Yan, do you still have any doubts?"

Chen Yan nodded: "There is another biggest doubt."

"That's why these four people died."

cause of death?

"You mean...why carbon monoxide poisoning?"

Chen Yan nodded.

Talking about the case with such an old detective is really refreshing.

As soon as Chen Yan said it, Qin Chuan knew what Chen Yan wanted to express.

"Team Qin, the house where Zhao Dezhi lives is an old community, but how many years has it been since the occurrence of carbon monoxide poisoning?"

Qin Chuan nodded.

Carbon monoxide poisoning has been rare in recent years.

In the past, due to economic constraints, some residents used charcoal or coal for heating.

Especially in winter, the possibility of carbon monoxide poisoning is high and the probability is higher.

However, now, especially in urban residential buildings, central heating is used in winter, and there is basically no possibility of carbon monoxide poisoning.

Not to mention, it's summer now, August.

The weather in Hulu is the hottest time of the year.

Where did the carbon monoxide come from?

Chen Yan checked Zhao Dezhi's home.

There are only two ways or possibilities that can produce carbon monoxide.

Natural gas stove and natural gas water heater.

Many people may have misconceptions about carbon monoxide poisoning.

It is believed that the human body has inhaled too much natural gas or liquefied gas, which is carbon monoxide poisoning.

Not so.

Whether it is natural gas or liquefied gas, its main components are hydrocarbon and alkane flammable gases.

The human body does not experience symptoms of carbon monoxide poisoning after inhaling these gases.

And it's far less deadly than carbon monoxide poisoning.

Carbon monoxide poisoning can only be effectively treated in a hyperbaric oxygen chamber after early detection.

After other hydrocarbons and alkanes are inhaled into the human body, as long as they go to a place with smooth ventilation and breathe more fresh air, they will be fine.

Moreover, in order to prevent natural gas or liquefied gas from being inhaled unintentionally, manufacturers will add irritating gases to the gas.

This is why the domestic natural gas, liquefied gas we use, has a smell.

Carbon monoxide is produced after the insufficient combustion of these hydrocarbons and alkanes.

The combustion is sufficient, and the gas produced is carbon dioxide.

"Generally, gas cooktops burn with blue flames."

"I tested the stove from the Zhao family's kitchen. The ignition was normal, and the flame was blue. There is basically no possibility of insufficient combustion."

"So, the cooktop is less likely to produce carbon monoxide."

"The most likely source of carbon monoxide is the water heater!"

Natural gas water heaters are different from stoves.

In order to heat the water as soon as possible, after the natural gas water heater is ignited, the natural gas output is large.

And because the space inside the water heater is small and the air circulation is not smooth, it is difficult to fully burn.

That's why natural gas water heaters have a dedicated flue that emits exhaust gas.

"However, the normal exhaust power of a qualified natural gas water heater exhaust port is relatively large."

Chen Yan has already tested it.

"The natural gas water heater in Zhao's family is normal for smoke exhaust."

Turning on the hot water in the kitchen sink, Chen Yan went outside the building to observe.

Zhao's house is on the first floor, so it is very convenient to check.

"The smoke extraction system is normal and there is no problem."

The smoke exhaust system generally has a protective cover.

After the protective cover is removed, it is a one-way opening and closing.

It's just an original piece of iron.

There is a spring to tighten.

When there is gas discharged from the inside, under the pressure of the gas, the iron piece bounces up and the gas is discharged.

When the water heater is not working, the iron sheet returns to its original position under the pressure of the spring, closing the pipe.

The role of this iron sheet is mainly to prevent the backflow of cold air from the outside in winter.

So how exactly is carbon monoxide produced?

Did the murderer bring it in and let each victim breathe?

This possibility...

In addition, there is the adopted son of the Zhao family, Zhao Danyang.

When the murderer arranged the corpse doll, he made no secret of his familiarity with the Zhao family.

Why?

Was it accidentally exposed?

Give me a break.

Judging from the position where the murderer hung the fishing line, the other party must have practiced.

The whole process was smooth and smooth, and there was no rework at all. It was definitely a very meticulous plan for the layout of the entire corpse doll.

Then consider the left-handed replicas of Ding Suxi and Zhao Dezhi.

The murderer's mind is delicate, beyond ordinary people.

And such a person will leave obvious flaws at the crime scene?

impossible!

The entire crime process took up to 5 hours.

The murderer was very cautious in the fabrication process.

Only a pair of rubber gloves was exposed.

No skin was exposed at all Even with gloves, Chen Yan found that the other party should be inside rubber gloves and wearing cotton gloves.

As a result, the silhouette of the opponent's hands is very inaccurate in the video.

It can be said that the murderer has done very meticulous work in any link that may reveal his identity.

How could such a careful and cautious person expose obvious flaws.

If there is, Chen Yan also believes that the other party is more likely to be misled.

After all, when the murderer started the live broadcast, the four victims were already dead.

The murderer investigates the scene first, and it is possible to find the location of the fishing line and scissors in advance.

However, during the live broadcast, the murderer deliberately showed it.

In addition, there is one detail that caught Chen Yan's attention!