The deed is already sent under legal protection before cops can confiscate or destroy evidence. http://www.thenation.com/blog/205889/new-aclu-cellphone-app-automatically-preserves-video-police-encounters I like it and you can modify it to conform with specific state statutes. Mind you the ACLU will not actually act legally on the tape despite their review, unless you engage them.
When police arrest someone with a camera, the first thing they almost always want to do is turn the camera off. When they raid a business, they almost always make it a priority to make sure the security cameras are off, or they will often try to take the security video tapes, and the business owner will not get them back. Law enforcement often seems to have an obsessive paranoia about cameras, and I suppose it's not really surprising. If ordinary people do not like being videotaped in public, having their daily actions subject to possible scrutiny at some later date, what makes us think police are any different?
