Yes...isn't that limited to roadblocks and tips on drunk drivers? Can this be used to frisk a ME man with a backback getting on a subway?
Er, no.
Can this be used to frisk a ME man with a backback getting on a subway?
Sure. If the backpack smells funny or he's wearing a big coat in the middle of a heat wave or a bomb dog indicates on him, etc.
A Terry frisk, mind you. Which does not include the contents of the backpack. However, the entire point of RAS is build probable cause for a search or arrest.