Aren't US cops afforded any personal input? I've been stopped in the UK for something I probably should have been arrested for, but the cop said he was just going to let me go because I was nice to him ¯\_(ツ)_/¯
They only review the videos if there's an incident or complaint. So it's not like there's someone watching 40 x 8 hour videos every day.
/this is a smaller rural area in the midwest US, so ymmv but these officers do use discretion and the higher ups don't care if it's nothing big. In the Chief's words, "we were all young and stupid at some point."
Right now there isn't, but some day, a computer might be able to do it.