Under normal circumstances.
The vast majority of monitoring retention periods are between 15 and 30 days.
Surveillance videos on main city roads, as well as in official organizations such as banks, hospitals, and police stations will be retained a little longer, for about three months.
and.
The current working principle of surveillance does not require someone to specifically delete recordings and free up space, but rather those recorded videos will be actively replaced.
Therefore, there should not have been any relevant surveillance footage for this case which happened half a year ago.
But Su Ming was not very worried about this.
Because, judging by the level of professionalism that Chen Sheng has just demonstrated and his attention to this case, it is impossible that he would forget to back up the relevant surveillance videos.
It is even possible... to copy all the surveillance videos of Lan Caier wherever she appeared in the ten days before the incident.
There is no doubt that this is a very tedious project.
But under the pressure of solving the murder case, the influence of public opinion, and Chen Sheng's inner pursuit of truth and justice.
In order to thoroughly uncover the murderer behind the scenes, no matter how tedious the work is, a lot of time will be spent on preserving some possible clues.
......
now.
After hearing what Su Ming said.
Chen Sheng nodded without hesitation, then started looking for it directly in the multimedia computer in front of him, and spoke slowly and confidently.
"Team Leader Su."
"Wait a moment. I'll look for the copied surveillance video."
"To be honest, we were unable to find the murderer in this case, and it was also the only unsolved case in Yangliu District in the past ten years."
"So, even though there weren't as many clues and breakthroughs as there are now, I still copied down all the videos related to Lan Cai'er in the short term."
"I'm just worried that if something is discovered later, I won't be able to find the relevant investigation records or surveillance videos. That would be troublesome."
“Got it! Found it!”
"This video is from the elevator surveillance video of the single apartment where Lan Cai'er was rented nine days before she was murdered. Maybe you can take a quick look at it first..."
Not finished yet.
Su Ming shook his head gently, interrupting Chen Sheng's subsequent words, and spoke seriously while stroking his chin.
"No, Director Chen."
"I think... there's probably no need to watch the elevator surveillance video."
"Based on previous information, Ghost must be a very cautious criminal who will do everything he can to hide his whereabouts."
"This can be seen from the fact that he was able to let Lan Caier live for seven more days, only to make her completely mentally and spiritually collapse, and voluntarily put her neck under the butcher knife he had prepared."
"As long as he is sure that the victim cannot escape his clutches, he will follow him around and wait for the best opportunity, like a true ghost, a maggot on the tarsal bone."
"So, the ghost will definitely try to get rid of surveillance as much as possible to reduce the probability of being exposed. Will he really leave the elevator, where his whereabouts will be recorded 100%?"
"I think... the ghost will most likely choose a more hidden staircase, right?"
"Not only can it avoid elevator surveillance, but it is also likely to avoid other residents in the apartment building, further improving its concealment."
"In high-rise buildings with elevators, even residents on the second floor basically only use the elevators. The most common items in the stairs are all kinds of miscellaneous items."
Speaking of this.
Su Ming paused for a moment, looked at Chen Sheng in front of the projector, and continued to ask.
"Director Chen."
"Lan Cai'er's family is not bad. If nothing unexpected happens, the single apartment she rents should be one of those newly built new residential areas."
"Then, such communities will have a separation of people and vehicles, with direct access from underground parking lots to the stairs of each building."
"Plus, the working hours of Golden Harvest TV Station are 8 o'clock in the morning. If the ghost wants to attack the orange cat raised by Lan Caier, it must avoid the time when Lan Caier is at home."
"So we only need to look at the period from 8 a.m. to the time when Lan Caier received the news and her mood changed."
"People who enter the underground garage, or vehicles that drive into the underground garage, can be used to determine the whereabouts of suspicious people and ghosts."
It's obvious.
By inferring the ghost's personality and completing the information of this case.
Su Ming has already narrowed down the entire search range to a very considerable extent that will not waste too much time.
After listening to Su Ming's words.
Chen Sheng paused for two seconds to think, then nodded in agreement and began to look for the surveillance video that he had specially saved.
Thirty seconds passed.
Chen Shengcai finally found the surveillance video that was most likely to reveal traces of a ghost, and then spoke with some emotion.
"Oh, the more I think about it, the more regrettable it becomes."
"At the beginning, we basically focused all our energy on the people around Lan Caier, thinking that this case was most likely committed by someone she knew."
"If we can check more of these related videos, maybe we can dig out the ghost sooner."
"No, even if we check the surveillance video in depth, we probably won't be able to check up to nine days ago. At most, we will only check whether there is anything unusual two or three days before Lan Caier's accident."
"I can only say that thanks to my previous experience in handling cases, I felt that these surveillance cameras might still be of some use. Otherwise, I'm afraid I wouldn't be able to find any surveillance cameras this time."
While Chen Sheng kept sighing, he turned on the surveillance video and adjusted the time to after eight o'clock, which was the time when Lan Caier had gone to work at the TV station.
The location of this surveillance camera is the entrance to the underground garage in the community where Lan Caier lives.
in other words.
Anyone who enters from the underground garage will be photographed by this camera.
But compared to the elevator, being captured by the camera at the entrance to the underground garage was not a big deal at all, and it happened nine days before the incident.
It is extremely rare for the police to check the surveillance footage nine days before the crime.
Not to mention.
And the probability of selecting an inconspicuous underground garage entrance from numerous surveillance videos is undoubtedly several times lower.
At the same time, another surveillance video from the same period was opened, which was located at the entrance of the underground garage in the building where Lan Caier rented.
In order to dig out the ghost as soon as possible.
Chen Sheng adjusted the playback speed directly to sixteen times and took a quick look at the general situation first.
According to the investigation records.
The time when Lan Caier had a mental breakdown in the middle of work was exactly 10 o'clock in the morning, that is to say... from 8 o'clock to 10 o'clock, a total of two hours.
The ghost came to this community specifically, broke into the single apartment rented by Lan Caier, and took away the underage orange cat in order to cover Lan Caier's mouth.
......
This moment.
Su Ming didn't say anything else, his eyes were all focused on the projection screen in front of him.
Although the current playback speed is sixteen times faster, you need to slow down and pass through the gate of the underground garage.
Therefore, the difficulty of overall judgment and analysis is not as high as imagined.
One minute.
Two minutes.
Three minutes
......
Just after the third minute, the internal time of the surveillance video reached eight fifty.
A silver-colored van with stickers saying "repairing leaks in houses, toilets, and minimally invasive leak repairs" appeared in the surveillance video at the entrance of the underground garage...
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