A device which looks like an old-time train whistle connected to a locked box – and mysteriously set up on a downtown San Francisco street corner – has been determined to be part of the Department of Homeland Security’s Super Bowl security preparations.
According to the department, it’s an air sampling device used in the BioWatch program; a national system for detecting a biological attack.
The monitor is connected to a pole which connects to a large, metal box with wheels. The box is padlocked and has a yellow tag on it with a stern warning from Homeland Security: “DO NOT UNPLUG!!!”