US setting up sensors to detect biological attacks

Via sanfransisco:

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�?

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