POV cams are cheap nowadays. Russian drivers have had crash cams in their cars for years because insurers kept refusing to pay claims (hence all the YouTube crash videos).
The POV camera is on a 30 min continuous loop. When something happens you hit a button and the last 30 min of HD video and audio are saved permanently along with the live feed until you hit the button again.
My wife bought one for her car. It cost $69. She got the high end model with the infrared light source. I’ve seen cheaper ones on sale for $38.
The cameras are not the issue. It’s the data storage.
Ok, I will give you an example.
There is a shooting, with multiple victims in a large urban department. Typically a dozen or more officers will show up, and that’s uniforms. Each one of them is going to be wearing a camera and must leave it on for the duration of the call.
A shooting scene can take hours to clear and because it is a life crime, that data footage has to be stored FOREVER. Now multiply four hours of footage times a dozen officer, times indefinitely.
Then for good measure, toss in three of four shootings a night.
See where it gets expensive?
Certain SJW groups like BLM want video footage keep for at least two years so they can subpoena them to try prove their racist agendas. What makes it worse is they have alot of political steam.