30,000 'Virus Shut Out' Necklaces Seized; Packaging Promised to Create Clouds Preventing COVID On 5/28/21 at 1:48 PM EDT U.S. Customs and Border Protection officers seized 30,000 "Virus Shut Out" necklaces from China that claimed to prevent coronavirus infection for wearers by producing anti-viral clouds, the CBP said Thursday. Border agents found three undeclared pallets of the wearables inside a tractor trailer passing through the Nogales, Arizona, border station into Mexico on April 16, the CBP's statement said. The lanyard-like devices contained a blue parcel of chlorine dioxide, which the U.S. Centers for Disease Control and Prevention says can cause respiratory irritation, breathing difficulty and chronic bronchitis after prolonged exposure.