A Boston-bound man wearing body armor, flame retardant leggings and knee pads under his trench coat arrested at Los Angeles International Airport after a Customs and Border Protection officer found a smoke grenade and several weapons in his checked luggage is facing a federal charge for transporting hazardous material on an airplane. According to an affidavit filed in federal court, Yongda Huang Harris, 28, a naturalized U.S. citizen of Chinese descent, was flying from Kansai, Japan, via Inchon, Korea, to LAX on Friday...