When they arrived at the scene, Bai Song, Wang Huadong, and Sun Jie put on gloves, rubber covers, hoods and masks, and entered the ruins.

It was extinguished by the fire department with water cannons, and everything that was burned was destroyed beyond recognition. Most of the physical evidence at the scene, as well as the deceased himself, has been taken away by the relevant authorities.

The three of them looked at the remnants of the scene, and the flammable things were almost burned, only some glass shards, baked fruits, and some dregs from the burning balloons remained, and everything else had been taken away.

...

"This is Inspector White of our headquarters. "The Zhuang detachment introduced Bai Song to the leaders of the criminal investigation detachment of the Xijing Branch.

"I've heard of it, I've admired the name for a long time, and I'm really young..." The Liu detachment here shook hands with Bai Song cordially, and pointed to a young man beside him: "This is Xiao Zhao, the criminal police who hosted it, you can ask him about the case." ”

...

Bai Song shook hands, made a polite gesture, and had a preliminary understanding of the case, that is, the Xijing Branch did not pay enough attention to it, thinking that it was an accident, and the organizers were not leaders.

This made Bai Song also a little puzzled, why did the Zhuang detachment come in person for this matter?

After learning some details from here, Bai Song planned to understand this matter clearly before going to see the physical evidence and human witnesses, so he specifically asked the Zhuang detachment, he was afraid of missing any important details.

"This construction site is a key project, and the site here's lockdown can't be too long. The Zhuang detachment said simply.

Bai Song nodded, understood the reason why the Zhuang detachment came, and then went to see the physical evidence and human evidence with everyone.

...

The cause of Yao's death was cardiac arrest caused by a heat burn - he himself had a bad heart.

"Who bought the balloon?" asked Bai Song.

"It was bought by the deceased's daughter, who originally wanted to accompany his father for his birthday, but Yao wanted to go out for a drink, so the daughter bought a balloon, then bought a cake and candles, and went back to school. Criminal policeman Xiao Zhao explained to Bai Song.

"How many balloons?

"Almost twenty, the size of a normal balloon. ”

"So little?" Bai Song said, "The explosion limit of hydrogen is 4% to 75.6%, below which it will not explode." From the scene, this single room is about 11 square meters, 2.7 meters high, almost 30 cubic meters, at least 1.2 cubic meters of hydrogen is needed, and these 20 balloons are only 0.1 to 0.2 cubic meters of hydrogen, which is an order of magnitude worse.

"Wouldn't it?" Xiao Zhao asked.

"What do you say?"

Bai Song's rhetorical question, Xiao Zhao and the people around him also reacted. This thing was learned in junior high school or high school, and it seems to be like this.

Previously, everyone suspected that the daughter who bought the balloon was suspicious, so hydrogen may not be the main cause of the accident at all.

This alone can be filed.

"Hmm..."Xiao Zhao said: "I'll go and talk to the leader about this situation now." ”

"Don't worry", Bai Song shook his head: "The hydrogen balloon floats in the sky, and it won't explode for no reason, even if it breaks a few and floats near the roof, it can't be ignited." Putting this question aside, let me ask you, where is the autopsy report of the deceased?"

When Sun Jie heard this, he immediately stepped forward and waited for the result.

"No results yet, only a tentative report, and the autopsy is still ongoing. Xiao Zhao thought for a while: "The cause of death should be a heart attack caused by burns." ”

"Brother Jie, you follow the people here and do a favor. After Bai Song finished talking to Sun Jie, he looked at Xiao Zhao: "Please call another person and take our forensic doctor to find out the situation over there." ”

"Good leader", Xiao Zhao took out his mobile phone to call.

Taking advantage of this, Bai Song asked Sun Jie, "Brother Jie, can burns cause heart disease?"

"If you have a history of heart disease, there are a lot of external factors that can cause heart disease. Sun Jie said: "However, the burn itself is not so easy to die, even if the body is poured with oil, the human body can last for a few minutes." Of course, five minutes later, even if he was still alive at the time, he was weak. ”

"Then does this person have a history of heart disease, and where are the medical records?" Bai Song then asked Xiao Zhao.

"Wait a minute, I'll ask..."

After five minutes, someone came over with a case, Sun Jie looked at the case, and followed this person to do an autopsy.

"East China, you can go to the scene again, be meticulous, and give you enough time. "Bai Song didn't say anything to the Huadong Tizhuang detachment, and he didn't urge Wang Huadong.

After speaking, Bai Song then looked at Liu Shuyuan: "Team Liu, if you are okay, go and help Wang Huadong." ”

"Good. ”

Wang Liang watched the three of them leave, and looked at Bai Song with a blank eye.

Bai Song then looked at Xiao Zhao.

Xiao Zhao Mo was a little weak-hearted, he was the policeman who knew the most about this case, but why did this Inspector Bai open his mouth and ask, he was a little worried...

"Inspector Bai, if you have something to say, just ask. Xiao Zhao asked first.

"Is the video coverage of this place very good, why did you say that the situation of the video was so sure before?" Bai Song was a little puzzled.

Before he came, he had heard that through the video recording, it could be determined that no one was near the house for some time before the deceased's death, so why was he so sure? Bai Song, the rental house, also looked nearby, and the camera did not dare to guarantee that there were no dead ends.

"That's right, Inspector Bai", Xiao Zhao finally had his own positive answer, "These places are where workers live, because there have been several thefts before, in order to prevent similar situations from happening again, there are many cameras here, basically there are no dead ends, the main reason is that they all use wide-angle cameras, you look at the surface of the camera, you feel that there are dead ends, but in fact they do not exist." ”

"Is the wide-angle camera infrared?" asked Wang Liang.

"Bring. Xiao Zhao nodded affirmatively, he will also answer this question, comfortable.

"Then how does this solve the problem of distortion in the image captured by the infrared wide-angle camera, and has the distortion been corrected?" Wang Liang asked.

"Huh?" Xiao Zhao's eyes widened, and the whole person was not good.

What's that?

"Team Wang, if you have time, go to their graphic investigation department to study. Bai Song said to Wang Liang.

"Good. Wang Liang nodded and left here.

"I know so much, Inspector Bai, the materials are all here, you can see for yourself, there is something that needs to be added... You tell me, I'll find someone to investigate. Xiao Zhao didn't dare to ask him if he didn't understand.

"Okay", Bai Song said with a warm face: "It's just a small case, let's cooperate with each other and learn from each other... Well... I will look at the records of all the people, including the children of the deceased, several people who had dinner with them before their deaths, all of the deceased's subordinates, ex-wives, bosses, other contractors, and related suspicious persons. ”

"Only a part, the rest haven't been found yet..."Xiao Zhao almost knelt down: "You take a closer look at the transcript, if there is a problem, you say, I hold the notebook, I remember." ”