Well... you answered my fear/question. I have always said that if an officer was charged with a serious crime and I was a juror, I would REALLY question testimony from other officers (especially if they were in the same department). In fact, I guess I would have to rely on forensics and completely dismiss LENF testimony all together. Dang!
What forensics the police will just mess those up also. Like they did in the case that org.whodat stated.