The best "If-A-Cop" stories are the simplest ones that answer these 3 questions:
~Where are you (all) going?
~Why are you going there?
~Where did you just come from?
The "If-A-Cop" story is ALWAYS discussed and shared with ALL members of the group BEFORE going anywhere and all members are also quizzed on the answers they will give should the "If-A-Cop" story actually be used because you've all been stopped by some sort of law enforcement personnel.
John: Did we forget anything?
Mike: I don't think so...
Mary: Yeah we did! We need to come up with an "If-A-Cop" story!!! Ya know, in case the cops stop us...
John: Oh yeah! Good lookin' out!!!