RAS

Not Knight's Armament's "Rail Adapter System", but "Reasonable, Articulable Suspicion".

LAAW has an interesting seizure chart that summarizes the classes of police encounters. There's a standard encounter where they can talk to you like a normal citizen (although ignoring or refusing to talk to the cop would probably be construed as RAS). Then there are two types of "Fourth Amendment seizures": detention/frisk, as per Terry v. Ohio (aka the "Terry frisk"), and arrest. The former is based on RAS, the latter based on probable cause (PC).

The word "articulable" bothers me, as it seems like it should be "articulatable", as in a noun form of the verb "articulate". Of course, that's hard to say, so the lawyers had to make it "articulable". Apparently I'm not the only one that this bothers.