"Mere sight" is not enough evidence for RAS. Bear in mind RAS is not a hunch or a feeling, or a "Well, I think he probably might be guilty".
Really.. care to cite?
To justify detention, the officer must be able to articulate more than an "inchoate and unparticularized suspicion or ‘hunch' of criminal activity." (Terry v. Ohio (1968) 392 U.S. 1, 27 [20 L.Ed.2nd 889, 909].)
An officer's decision to detain cannot be predicated upon a mere "hunch," but must be based upon articulable facts describing suspicious behavior which would distinguish the defendant from an ordinary, law-abiding citizen. (Terry v. Ohio, supra.)
"A hunch may provide the basis for solid police work; it may trigger an investigation that uncovers facts that establish reasonable suspicion, probable cause, or even grounds for a conviction. A hunch, however, is not a substitute for the necessary specific, articulable facts required to justify a Fourth Amendment intrusion." (People v. Pitts (2004) 117 Cal.App.4th 881, 889; quoting United States v. Thomas (9th Cir. 2000) 211 F.3rd 1186, 1192.)
A stop and detention with little if anything in the way of suspicious circumstances to connect the persons stopped to a perceived imminent criminal act, is illegal. The officer admittedly was acting on his "gut feeling" that defendant was involved. (People v. Durazo (2004) 124 Cal.App.4th 728.)
Detention of suspected illegal aliens is not justified unless accompanied by some particularlized conduct that corroborates the officer's suspicions. (United States v. Manzo-Jurado (9th Cir. 2006) 457 F.3rd 928.)
Observing defendant sitting in a parked motor vehicle late at night near the exit to a 7-Eleven store parking lot, with the engine running, despite prior knowledge of a string of recent robberies at 7-Elevens, held to be not sufficient to justify a detention and patdown. (People v. Perrusquia (2007) 150 Cal.App.4th 228.)