Could be suggestive of criminality and that could give you basis to approach and talk to and perhaps pat frisk but not to arrest. when they did pat frisk and found that knife, should they have arrested based upon the knife. if the defense gets that knife thrown out, suppressed not coming into court, in light of the fact that you know what? it was a legal knife. it was illegal and the police had a business basis, it could change the case. >> let's look into the investigation into the baltimore city police department. they're going to review a pattern of practice review. what does that mean? >> ...