When the data is received and not needed for a warrant or other charge the data should be instantly deleted. No backups, no nothing. All over in 15 seconds or less.
Israeli has Toka which can hack Flocks and probably Axons to delete information OR CHANGE IT undetectedly. Manufacturing “evidence” has become ever so much easier. When you receive your traffic ticket in the mail that no police officer or even desk clerk ahs issued what happens to your right to confront your accuser other than pulling down the camera, and what will that get you??