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Depends on the agency and how long they want to keep the footage, which I am not privy to. I can only tell you from the IT perspective.
The misconception in the previous few comments is that "Oh just search CCTV footage can already".
Again taking the train example :
number of cameras a train x
number of hours / train x
number of train x
how many days of storage.
You can see how the number quickly scales up, exponentially.
This is not your home CCTV that you can store in a simple SD card with no backup and redundancy.
We are not talking about your regular home use IP cam with SD card loop recording option. For a 6 channel CCTV system with dedicated DVR (with HDD backup) can easily store up to a month's recording footage.
So for the case of gov agencies CCTV setup, which most probably backup to server/cloud, we can easily say they track a windows frame of 3 months' footage which is easily recoverable.
Won't they have AI tools to search CCTV footage nowadays though?
They probably are some AI in play
Some examples would be
1) Speedcam - Where they compare several frame shots to determine the speed of the vehicle
2) OCR (Object Character Recognition) - To determine the car registration plate number / identify off-peak cars (Red license plate)
I don't think the current AI is smart enough yet to determine the human behavioural patterns