novice forensic medicine

Chapter 160 A Fragment of a Wine Bottle

Following the sound, Zhou Ning went upstairs quickly, followed by Xu Dayuan.

Da Zhao held up an evidence bag, which contained an L-shaped object, which was black but looked like metal, and the broken end showed signs of being chopped.

Zhou Ning recognized that this was a doorknob. Although it had a very simple shape, this kind of craftsmanship must be very expensive. After all, the paint did not lose its shape even after being fired.

However, it seemed to have crocodile skin-like lines on it. Zhou Ning took the bag, lifted it up and looked at it carefully, and instantly thought of the scar on Dong Chengwen's hand.

"The doorknob of the master bedroom? Mark it and go back to test the skin tissue on it. If Dong Chengwen is not lying, then it is the skin of his hand."

Xu Dayuan glanced at him with disdain, and then stared at Da Zhao.

"Just seeing such a thing, do you make a fuss?"

With a bitter look on his face, Da Zhao spread his hand towards Xu Dayuan and pointed around.

"It has been searched more than once in a blanket manner. Just looking at these footprints, no less than 40 people have entered the scene, regardless of the firefighters who rescued them or the police who later investigated. All valid evidence that can be found has been searched again. You slipped through the net, shouldn't you be happy?"

Xu Dayuan didn't speak, saw Yang Xuetong clean up the pile of trash-like things in the middle of the bedroom, followed him to look, Yang Xuetong sorted and sorted, and explained:

"Da Zhao is right. There was little evidence at the scene of the fire. The firefighting process was meant to destroy the scene. It has been searched many times, the garbage has been screened, and the ground has been cleaned. There is nothing wrong with such a scene. Valuable evidence."

Xu Dayuan rubbed his hair. He knew it was difficult, but he didn't expect that there was nothing left at the scene, but Zhou Ning didn't speak, and stared carefully at the dark bedroom.

The bedroom is more than 30 square meters, and it is wider than the living room of ordinary people. There is a window on the south side and the east side, but they have completely burst, which shows how fierce the fire was at that time.

There is a bed on the north wall, and now only the metal frame is left, even so, the original luxurious state of the bed can be seen.

The bed was also the place where the flames burned the most. Only the spring skeleton was left on the mattress, and on the built-in bedside table next to it, there were red wine bottles and cups that were broken in situ.

There is an area with the most serious burning on the ground. Judging from the scorched black shape, it is a rectangle with a large area, extending from the front of the cloakroom door to under the bed. There is no remnant of the floor here, and the concrete floor has cracks. It seems that there is a thick long-haired carpet here.

Next to the bedside table is an open cloakroom, near the bedroom door, where there is no door, it should be the bathroom.

The bathroom is fine.

Zhou Ning walked to the cloakroom. There was a window and a dressing table in the middle. The decoration here should be a wooden structure, so the fire was even more serious. There were fallen metal rods everywhere, and even cement blocks that had fallen off. Block turned around.

Walking to the dressing table, Zhou Ning slipped, as if he stepped on something. He raised his foot and the shoe cover was scratched, revealing a shiny thing on the ground.

Zhou Ning squatted down and wiped the ashes lightly. The melted glass shards were exposed. Da Zhao followed behind Zhou Ning. Seeing what he found, he hurried over to take pictures.

Then he also squatted down and gently pried it with tweezers. The floor was completely carbonized without any effort.

"Could it be that the fire started in the cloakroom? I remember that the melting point of glass is 500 degrees, and in a general fire scene, it can reach 10 degrees after 15-400 minutes. However, there are too many combustion aids here, so it is not impossible."

Zhou Ning stared at the glass in Da Zhao's hand, and then looked around.

As the feet continued to rub against the ground, many dots of glass were revealed, extending to the door of the cloakroom. At the corner of the door opening and the edge of the baseboard, there was a piece of glass the size of an egg that glowed green.

Da Zhao rushed over, quickly took a picture of this piece of glass with a scale, then pried it up and put it in an evidence bag, and looked at the dressing table. After all, there were a lot of broken bottles and jars here, and many of them were burnt to half. state of melting.

"Green, I don't know what kind of cosmetic bottle it is? Wait for Sister Liu to come back later, and ask her to see if she can recognize it."

Zhou Ning stared at the window, checked the distance with his eyes, folded his arms and pursed his lips tightly, Da Zhao looked puzzled.

"What's the matter Zhou Xiaozhou, don't you think this is a cosmetic bottle?"

Zhou Ning pointed to the position of the first piece of glass and waved to Xuetong Yang.

"Come here, Yang Trace, and measure the straight-line distance from this position to the window?"

Yang Xuetong went over with a tape measure and measured the distance.

"The straight-line distance from the window to here is two meters eight."

"Go ahead and measure the distance from the window to the opening of the cloakroom door."

The movement here also attracted Xu Dayuan, he leaned over and looked at the glass in the hands of Zhou Ning and Da Zhao, with a puzzled expression on his face.

"It's not uncommon for glass to shatter at the scene of a fire. Zhou Xiaozhou, what do you think is the problem?"

Zhou Ning pondered for a moment, and then said:
"This needs to be confirmed with the fire department. I remember doing a question. What can the traces of glass damage in the fire scene prove? I answered this question wrong, so my memory is very deep. The correct answer is:
It can be proved that the direction of the force, the time of fragmentation, the intensity of the fire, and the temperature of the fire scene are four items. In general, the glass shattered at the scene of a fire, mostly because the high temperature increases the internal pressure, thus bursting out of the window, even if there are glass fragments in the room. , won't splash so far. "

Saying that, Zhou Ning walked to Da Zhao's side, brought over the green glass evidence bag, asked Yang Xuetong for a magnifying glass, and brought it to Xu Dayuan, asking him to look at it carefully.

Xu Dayuan held up the magnifying glass with doubts. The edge of the green glass was no longer sharp. It had obviously melted a little, and only some small dots could be seen.

However, in the middle position, one letter and four numbers can still be seen carefully. It seems to be 2009 after a capital B. Of course, it may also be 2008, because that part is very vague.

Zhu Xingxing leaned over, the young man had good eyesight, she was not afraid of the scene, and asked directly:

"B2009 What does this mean?"

Big Zhao leaned over, took a closer look, and patted his head.

"I took it for granted. I didn't look carefully just now. This is a beer bottle. It is the beer bottle of our Qindao No. [-] Factory. There seems to be some national standard regulation. It is necessary to distinguish the type and year of beer bottles produced before and after, so the beer is required to be marked. B, and then add the year of production, but how did this beer bottle blow up here?"

Xu Dayuan threw the evidence bag to Da Zhao, frowning.

"There is a possibility that someone threw a beer bottle filled with gasoline at this window, which is equivalent to an incendiary bomb. With the blessing of combustible materials, and there is no door to block the cloakroom, the fire will instantly engulf the entire room. If people do not react in time , unable to escape."

Zhou Ning nodded, that's what he suspected. Picking up the half brick, Zhou Ning shook its weight.

"If the Molotov cocktail hits the glass directly, it will shatter directly, but it is much easier to smash the glass with a brick and then throw the Molotov cocktail through the defect."

The location where the glass shards splashed was too far away, and it was at an angle with the fragment of the wine bottle. It was thrown directly towards the door of the cloakroom from the window, but the sound of bricks breaking the glass and Molotov cocktails would not be low. Why didn't Fang Hua and her daughter wake up?
According to Dong Chengwen's words, Fang Hua was hungry, and Xiaomi was also hungry, so he went out to buy food, and after going out for only 10 minutes, the place was already on fire, could it be that he fell asleep?And sleep pretty dead?
Yang Xuetong was embarrassed. He was the one who searched here just now. He found the melted glass and didn't take it seriously. Unexpectedly, Zhou Ning found a problem with it.

"Leader, please criticize me, my survey just now was not careful."

Zhou Ning shook his head.

"I think too much. When we take over such a case, most of them are screened many times by others. It is a probability event to find the problem. Okay, now clean up the locker room and mark the positions of all the glass. The transparent glass and the green glass are respectively label."

Zhu Xingxing leaned over and distributed several small signs.

Several people quickly cleaned up the scene and began to place signs, from the window to the cloakroom door opening, and finally found that there were some on the floor of the bedroom, but it had been mixed with the cement below.

Xu Dayuan went out, he sent someone to check the backyard of the villa, and called Liu Yufei, since he was looking for all the materials, he also asked for the surveillance cameras he copied earlier.

If someone throws a gasoline bottle on the north side of the villa, there must be traces around, and the surveillance will record it.

Seeing that they were busy, Zhou Ning went downstairs.

The layout of the first floor is more open, a hall of nearly [-] square meters, the kitchen and dining room are glass curtain walls, but the view is wide, but now the glass is basically broken, revealing a door behind the kitchen, which leads to the north side of the villa.

Walking to the restaurant, there are many overturned chairs and a lump on the ground. Zhou Ning cleaned the ashes with a brush and found that it was an upside-down cake tray.

Zhou Ning gently lifted the tray and found that the cake was completely rotten, but there were dark brown marks left on it. It can be seen that this chocolate cake is not big, only about eight inches, and there is a card with a fork on the ground next to it, which says dear Happy eighth wedding anniversary.

Zhou Ning put the cake tray and the fork card into the evidence bags respectively.

You can go down to the first floor along the stairs, and there is a room next to the stairs, the door is open, Zhou Ning opened the door and looked inside, there are a lot of fishing gear and children's carts hanging in it, and a piece of furniture is thrown on the table beside it. Men's sun protection clothing, next to it is a standard equipment for evidence collection and photography.

It seemed that it was left behind by the people who came to investigate the scene before, but thinking of Dong Chengwen's narration, Zhou Ning suddenly realized that maybe he found the fuel ticket in the pocket of this dress.

Zhou Ning didn't stop, and went directly to the B[-] floor along the stairs. There are many rooms here, and they are hardly affected by the fire, but there are water stains on the walls in some places. There are billiard room, audio-visual room, study room, laundry room, nanny house.

Enter the garage from the basement floor, but there is also an anti-theft door next to the rolling shutter door. Zhou Ning pushed open the anti-theft door and found that it was connected to the underground parking lot.

The moment he turned around, Zhou Ning stopped, his eyes attracted by a pattern on the wall.

　Thank you for your generous rewards!
　　
　
(End of this chapter)