A device which looks like an old-time train whistle connected to a locked box a�� and mysteriously set up on a downtown San Francisco street corner a�� has been determined to be part of the Department of Homeland Securitya��s Super Bowl security preparations.
According to the department, ita��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: a�?DO NOT UNPLUG!!!a�?