Hashes should be standard for this kind of situation. Sending a hash every few seconds ensures that the audio/video 1) was created and 2) can't be forged. If a

Hashes should be standard for this kind of situation. Sending a hash every few seconds ensures that the audio/video 1) was created and 2) can't be forged. If a device "disappears" or is damaged we won't know for certain if it was to destroy evidence or not, but an officer with too many issues can be investigated or fired. Hashes can also be made public without privacy issues, to increase trust that the police are not editing the video.