When a patrolman I was pretty gung ho and carried my primary, my issued back up on my ankle and another back up in my pocket. They weren't really back ups but alternate guns. The one in the pocket was for traffic stops, the one on the ankle was in large part because I spent a lot of time in a patrol car at slow speeds in high crime areas and being left handed access and easy presentation to my belt gun was limited. Nowadays as a regular guy I like the idea of carrying a second gun, but since I don't wear uniform trousers anymore I hate pocket carry and not being a real big guy (6'0" 175 lbs) other methods just aren't that comfortable.