We had a litter pick up in NLV and the cops didn't bother us. A couple months ago I filled up at the gas station on Lake Mead right across from the police station. I was OC'ing. One patrol car saw me and drove off. Another patrol car pulled in a minute later and saw me, waited till I was done filling up, and then left. No incidents.
Many members here are also residents of North Las Vegas and their reports also indicate no problems at all.