It didn't matter if Zhou Ning went over, Da Zhao had already run over with a brick.

Zhou Ning took a closer look, the brick in Da Zhao's hand was similar to the broken bricks thrown on the roof, all with moss, which looked very old, but next to the moss, black-brown blood stains could be seen.

"Very good, continue to look for it, there are a lot of debris on the roof, I have checked inch by inch, which direction is the surveillance aimed at, and where was the body finally found?"

Da Zhao found a hand-drawn map, and at a glance he knew that it was in the car, Liu Yufei asked He Hongjian to dictate, they drew it, compared the direction, Da Zhao pointed to the easternmost position of Building No. 2 on the north side of the doorman, and said:

According to He Hongjian, the video record given by the police is the picture of this camera, but after identification, it was the shoes that fell down, and He Hongjian and his daughter-in-law found the shoes in the morning.

As for the body, it fell on the west side of Building No. 3, and was blocked by a row of attached rooms below, and fell into that small open space. ”

"That is, there is no camera at the angle of the west side of Building 3 and the annex, right?"

Da Zhao nodded.

"There are three cameras in total, one is across the road from the doorman, facing Building One, and the other is in that position, but it is facing a few unit doors in Building 2, and even if someone passes underneath, they can't see it clearly."

Zhou Ning walked towards the west side of the platform, there was no blood on the ground here, the deceased's head was injured, and there were blood stains left on the bricks, but nothing was found at the scene, isn't this the first scene?

"Have you checked it carefully? Is luminol sprayed? ”

Da Zhao sighed.

"I've checked it all, I used seven bottles of luminol reagent, and I found a blood drop on the edge, I don't know what Lao Yang found."

Lao Yang shook his head, before he came, Zhou Ning knew that if there were professionals involved in concealing this case, or falsifying the scene, it would be very difficult in the investigation process, but he still didn't expect that there was nothing useful at all.

"I didn't find anything else, but I tested it with test strips, and there was a large area of chlorine-containing disinfectant on the doorknob on the top platform and on the road to the west, and according to the marks left on the ground, it was carefully scrubbed."

Following the direction of Lao Yang's finger, Zhou Ning followed the quick step over and squatted down to check, and sure enough, the handle on the west side of the doorknob was darker, close to the edge of the south side, and there were uniform traces left by brushes on the ground, all of which were fan-shaped traces, extending to the westernmost rainwater inlet.

Lying on the edge of the roof, Zhou Ning looked down, this rainwater pipe was broken four meters from the ground, and it seemed to be in disrepair.

"Go down the high-speed rail, let the driver Lao Wang find you a ladder, go up from below, see where the rainwater pipe is broken, whether there is any splash, especially to find traces of blood and various liquids, and sample, as for the above, the position that has been brushed, Lao Yang and Da Zhao also sample."

Sun Gaotie ran down quickly, and Lao Yang was a little puzzled.

"Didn't the boss say that after scrubbing with 84 disinfectant, the blood stains and DNA were destroyed, what is the point of this collection?"

Zhou Ning shook his head.

"Among the chlorine-containing preparations, 84 disinfectant is the easiest to obtain, and it can indeed clean up blood stains and destroy DNA and proteins, but it only causes protein denaturation in DNA, but DNA fragments can still be extracted, and of course such fragments can also be compared."

Hearing this, both of them were a little excited, and Da Zhao snapped his head and remembered it.

"I remember, the team doctor of the figure skating team used this method at that time, and we still found the DNA in the residue, but it was a sewer, and there were a lot of things hanging on, this"

Lao Yang pulled Da Zhao away, Zhou Ning didn't know that there were few traces left here, but it also showed a problem, maybe this was not the first scene of the persecution of the deceased.

Zhou Ning dialed Xiaoqu's phone, and the other party was connected on the second call.

"Director Zhou, don't worry, the monitoring has been deleted, the method is very professional, I'm trying to recover, but it will take a little time, as for the video sent by the Zhong Bureau, I watched it black, and something did fall at 23:37, and after slowing down, you can confirm that what He Hongjian said is true, this is a shoe."

"Well, then hurry up and recover, the school's monitoring, have you been to see it?"

"Look, the situation is basically the same, the original monitoring files saved have been deleted, and I found that there is a corner of the monitoring, just to shoot a corner of the salt industry community, I don't know if it is a follow-up adjustment, or it has always been the case, I am trying to recover."

"Okay, I've got some news."

After saying that, Zhou Ning hung up the phone, at this time Da Zhao and they had already completed sampling, lying on the edge of the platform, looking down at Sun Gaotie, he had climbed to the position where the rainwater pipe was broken, this goods were even more ruthless, not collected with a swab, but directly scraped the paint on the surface of the building with a knife, it seemed that the paint was a large piece for a long time, and the finishing box in his hand was almost half.

Zhou Ning rubbed his nose, it seemed that he had to hurry down, otherwise this thing would be able to peel off the wall skin from there to the first floor.

"Da Zhao hurriedly went down and told Sun Gaotie to collect some of them, and then peel them off, and the residents here will all complain."

Da Zhao looked puzzled, glanced at it, and almost laughed.

"This kid can, I'll use this trick next time, but it's easy to find any residue."

Zhou Ning glared, and Da Zhao ran away.

Lao Yang had a sad face, and ripped off a layer of gloves, and the smell of the heavy chlorine-containing preparation was pungent.

"Boss, the sampling is done, but I look at it, it doesn't seem to be the first scene, the time of the crime is March 28

The lowest temperature of the day in Xinghua City was minus 1 degree, six to seven winds, how addictive is it, the cold wind on the roof of the building, what are you doing? ”

This sentence reminded Zhou Ning, he had thought before that since there are so many tenants in this community now, there may be such a household, which is the place where the violence is really committed.

"Let's go, go downstairs first, you go to see the place where the deceased fell, see if there is any residue, I'll go to Sister Fei, the Xinghua City Bureau hasn't given the scene investigation report yet, this process is a little slow."

Lao Yang nodded, followed behind Zhou Ning, carrying the survey box and a box full of samples, and quickly went downstairs.

On the way, Zhou Ning took a look, except for the west house on the second floor rented by He Hongjian, the other houses have not changed the original style of the anti-theft door, there are blessing characters and couplets on the door, and the walls are full of small advertisements, such as drainage, moving, unlocking, repairing household appliances, and everything.

As soon as he went downstairs, he saw Liu Yufei coming over, and Zhou Ning hurriedly followed Liu Yufei to a position where no one had gathered.

"Neither the Xinghua Municipal Bureau nor Director Zheng came over, nor did they send the survey report?"

Liu Yufei shook her head.

"I made a phone call and said that I would send someone to send it immediately, but Director Zheng said that he was going to a company, and he called the police six or seven times in the morning, and I heard that there was a mentally ill drunk who rushed in and committed murder, carrying a knife and slashing people everywhere."

Zhou Ning glanced at the time, and it was only 12:07 at this time.

"I called six or seven times, which means that I started calling the police very early, this person drank so early, this is breakfast?"

Liu Yufei frowned and nodded slightly, obviously the truth of this alarm is self-evident, at this time, you can see that the fifth middle school began to leave school, and people wearing school uniforms walked into the community one after another.

At the same time, a police car drove straight in, and the siren roared wildly, causing everyone to look over, and several half-grown children were running and jumping in the neighborhood, almost being scraped by the car even if the parents dragged them.

A policeman cursed, as if to accuse the woman who was guarding the child, and his hand was stretched out, his fingers turned into palms, and he scratched and teased the child's head.

Only then did he hold a file bag and search for the target, in fact, Liu Yufei was very recognizable, the woman was wearing a police uniform, and her aura was still so strong, and when she found Liu Yufei, this person quickly ran to the front and handed the file bag to Liu Yufei.

"I'm sorry Liu Da, I was delayed on the road, I am Liu Mo, the deputy captain of the criminal police team of the Xinghua City Bureau, this case is considered to be a suicide, so there is not much information left, and it is not too easy to find, this is the investigation report."

Zhou Ning glanced at it, the deputy captain of the criminal police team, who looked to be in his thirties, although he was in a hurry, there was a smile on his lips, the smell of cigarettes all over his body, the corner of Huazi leaked out of the edge of his pocket, the police uniform jacket was temporarily put on, the collar was turned inside, and there was dust from the seat belt on his right shoulder.

It seems that he is deliberately delaying, he smokes on the road, and it is such a high-end cigarette, and the police car he sits in is very new, but no one usually uses the seat belt of the co-pilot, and he was sent to contact the superior task force.

Liu Yufei glanced at it, and then handed the file bag to Zhou Ning.

Zhou Ning flipped through it, the survey report was simple and outrageous, there were only two pages in total, the first page was the survey findings, and the survey results, there was a lot of nonsense, and there was only one useful sentence.

After the on-site investigation, it was found that on the edge of the roof platform, there were footprints of the deceased, no suspicious objects were found at the scene, there was no abnormality around the deceased's fall, and the deceased was determined to have committed suicide and fell to his death, and the investigation time was March 29, 2013.

The back page is a hand-drawn map of the scene, above is the state of the top floor, as well as the location of the footprints, a comparison photo of the footprints and the soles of the deceased's shoes is clipped, and below is a map of the deceased's death location, and a photo is also pasted, the deceased is lying on his back, his arms stretched out at a 45° angle to the south, and the zombie is very obvious.

Zhou Ning opened the file bag and rummaged through it.

"No autopsy report?"

Liu Mo patted his head, as if he had just remembered, quickly turned around and ran towards the police car, took out another file bag from the back seat, and ran back again.

"Look at my brain, just thinking about the investigation report, I forgot what Forensic Doctor Zhang gave me."