[Posted Friday, June 29, 2012, at 10:40 p.m., updated Saturday, June 30, at 8:40 a.m.] A month ago, a police officer in Portland, Maine, stopped a person for openly carrying a pistol -- which is legal in Maine. The person was a law student who clearly stated that he did not consent to search or seizure, and who cited several important court cases (including US Supreme Court cases) that defended his Fourth Amendment rights not to be stopped without articulable suspicion of violating the law, nor to have his gun seized, nor to be forced to identify himself. The man requested that the officer call his supervisor; the police supervisor arrived and had the man released.
The Web article, at http://www.infowars.com/law-student-takes-cop-to-school-after-being-illegally-stopped-for-carrying-gun/ , includes the video of the event that the man took with his cell phone camera, as well as Web links to these cases:
Delaware v Prouse, 1979 (cannot be detained without suspicion of criminal activity): http://www.law.cornell.edu/supct/html/historics/USSC_CR_0440_0648_ZS.html ; also http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=us&vol=440&invol=648.
US v DeBerry, 1996 (cannot be stopped over a legally carried firearm): http://caselaw.findlaw.com/us-7th-circuit/1027378.html . (But note: "At least as far as the Fourth Amendment is concerned, police do not have to have any degree of reasonable suspicion in order to accost a person and say they want to talk to him. ... But the law is well established that if the officer asks rather than commands, the person accosted is not seized, and so the protections of the Fourth Amendment do not attach.")
Terry v Ohio, 1968 (cannot have gun seized without reasonable suspicion): http://en.wikipedia.org/wiki/Terry_v._Ohio . (Note: a "Terry frisk" IS permitted if the police officer has a reasonable suspicion that the person has committed, is committing, or is about to commit a crime and has a reasonable belief that the person "may be armed and presently dangerous.")
Brown v Texas, 1979 (cannot demand ID without reasonable suspicion): http://en.wikipedia.org/wiki/Brown_v._Texas .