I've said it before and I'll say it again, anyone who assumes that carrying in a holster automatically means the person is a "good guy" is a fool. While the majority of crooks don't use holsters, a sizeable minority do. Just like most crooks will carry any gun they can get their hands on, while some crooks are very picky in their gun selection. Anyone, cop or not, who assumes a person is not a criminal simply because that person uses a holster is an ignorant fool. I've arrested enough crooks with holsters to know better.