However, his innocence is in doubt since apparently his only factor for deciding the officer was another criminal was the tattoos... that's not a reasonable assumption.
Agreed. I find it a bit harsh that some of the other posters relate tattoos to bad guys. They are much more common than they used to be. While I do agree that visible tattoos can still be seen a unprofessional, a lot of military and police, including me, have tattoos. If tattoos and a civilian car are this guys only reason for thinking the cop was another bad guy, he's going to have a tough time in court, and I foresee a change in policy in the near future for the inked cops department.