According to http://www.myentertainmentworld.com/mew/film_production_newlisting.html]My Entertainment World Law Abiding Citizen “may” be filming in Philadephia this Fall. Their site currently reads:
LAW ABIDING CITIZEN – Fall, 2008 – Philadelphia, PA; Details Are only Available By Subscription.. STORY: The film is about a successful district attorney who finds himself at the center of a vigilante plot hatched by a traumatized victim of the legal system. (Posted: March 5, 2008. Revised: August 7, 2008)
We have sent this to be verified, so, like Detroit, this is still just a “possible” location and nothing has been confirmed at this time. đ