Slideshow: Images from a homeland security experiment
By , Senior Editor
Department of Homeland Security officials recently simulated the release of airborne contaminants in Boston's subway system, known locally as the 'T.' The exercise aimed to gauge how the air flows in order to be ready in the event of a real security incident.
Photo credit: Joan Goodchild

Public explanation

A scientist with a team of investigators for the Department of Homeland Security explains how a simulated chemical attack will take place throughout the subway system in Boston as part of a test on airflow.


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