You will need to subpoena the video. By letter, contact the appropriate agency and put it on notice that they are not to destroy or erase the pertinent tape. Then subpoena them as soon as possible. You will need to take the deposition of the officer who was in charge of the particular police unit as well as the officer who was in charge of the recording devise to lay the appropriate foundation for the tape's authenticity.
Answered on Feb 26th, 2013 at 6:51 PM