Well, alls I remember is getting arrested the last time I did it lol, and a realative of mine who has been is a Seargent (sp?), and been a cop for like 22 years told me next time, tell them "Yes, as a matter of fact I would mind if you stepped in for a moment". Loooong story.
Maybe the laws are different in your neck of the woods, but thats how they roll in Detroit.