I've had law enforcement just happen to show up three or four times. This was either when I OC'ed into a place for the first time, or late at night (I work nights, so 4AM for me is like 4PM for most), or in a non-traditional manner (Safariland 6004 Thigh holster - not my normal way to OC). However, in only one of these experiences was I actually approached and addressed by the responding LEO's, which speaks volumes for the education level of the agencies in my area. The one incident I did have was really a non-incident, the LEO's did not question me, but were just relaying the desire of management (who, for some unknown reason were unwilling to approach me themselves) that I either conceal if I had a permit, or remove my weapon from the store. My wife and I had been shopping there for nearly an hour, and I didn't want to walk out, just to have to repeat the procedure elsewhere, so I untucked my shirt and made everyone happy.