What suspicious behaviour? Stopping to talk to smeone on a street? thats cause? I do it all the time. Suspicion of what? Talking to someone? That's criminal?
Stopping L'ron after you have watched him engage in suspicious behavior, again, isn't without cause.
Dont care what experience he has. Stop and frisk withut probable cause is a 4th amendment violation.
Something critics rarely make note of is that when the cops stop L'ron, a black male, on Flatbush Avenue, there are perhaps 10-50 other people walking or loitering on that block that the cops didn't stop and frisk. So what set L'ron apart? Until proven otherwise, I'm going to say it's the experience of the cop t know who and what he's looking at.