The Department of Homeland Security will miss a July deadline to comply with a federal law meant to thwart dangerous cargo arriving by sea, frustrating border security advocates who say the country’s ocean gateways, including the Port of Boston, remain vulnerable to terrorist attacks. Representative Edward Markey, for one, accused the agency of not making good-faith efforts to enforce a 2007 law he co-sponsored requiring that all US-bound shipments be scanned for nuclear weapons and other dangerous materials. Only about 5 percent of all maritime cargo are scanned.
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