Lithium-ion batteries are coming under increased scrutiny as a possible tool for terrorists intent on bringing down an aircraft, according to lithium-battery experts. "If there's a need for special packaging for batteries in the cargo hold, why are there not special precautions in the passenger cabin?" asks Billie Vincent, a former FAA security director. TSA says it has looked into the issue and concluded that lithium-ion batteries "cannot be used as an explosive and are not a security threat in personal carry-on quantities."

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