What US cities have open air dope markets, basically which cities would fall under the "layover rule". Which is to say if i have a flight layover in a city and got 4 hrs between flights i can hit the city and score on the street and make it back in time.
I'll start with what i know, being from CHicago i can definately say that it fits the bill
Chicago
Philly
Baltimore
Bunch of towns in Northern Jerzy i don't know
What else.