The technical solution is: body cam footage is automatically, frequently, uploaded to cloud servers that the department does not control. The department gets read-only access, nobody gets the ability to delete footage for 7 years, and defense attorneys get automatic access to everything remotely related to their case.

Also: planting evidence and sending the falsely accused to prison for 6 months is a misdemeanor punished with suspended sentences and probation? That department owes the falsely accused damages for lost wages and damage to their ability to obtain future employment. That’s actually a “superpower” cops know all too well: if you’ve never been arrested they can seriously screw up your life with absolute impunity just by arresting you - charges never have to be filed, that arrest on your record - however baseless it may be - can hurt you in all sorts of ways, especially employability, for the rest of your life.