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cost effective security
more air marshals have been arrested since 9/11 (for crimes like smuggling explosives, domestic violence, drunk driving and human trafficking) than the number of people arrested by the marshals. The $860 million spent on the service amounts to about 4.2 arrests per year, at a cost of $200 million per arrest.
-- from Boing Boing coverage of http://duncan.house.gov/2009/06/22062009.shtml
-- from Boing Boing coverage of http://duncan.house.gov/2009/06/22062009.shtml