Testing for Explosives in the Chicago Subway
Chicago is doing random explosives screenings at random L stops in the Chicago area. Compliance is voluntary:
Police made no arrests but one rider refused to submit to the screening and left the station without incident, Maloney said.
Passengers can decline the screening, but will not be allowed to board a train at that station. Riders can leave that station and board a train at a different station.
I have to wonder what would happen if someone who looks Arab refused to be screened. And what possible value this procedure has. Anyone who has a bomb in their bag would see the screening point well before approaching it, and be able to walk to the next stop without potentially arousing suspicion.