The Homeland Security Dept. is stepping up its search for better technology to screen carry-on bags, now that it says it's OK for passengers to bring small amounts of liquids and gels onto U.S. airliners again. In addition to developing technology that can identify liquid and plastic explosives, department officials are considering replacing the X-ray machines at most carry-on bag checkpoints with the same explosives detection systems (EDS) technology now used to screen checked ...


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