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Counterfeit N95 masks hit U.S. hospitals by the millions. But some work surprisingly well.

N95 masks are prized for their ability to filter out 95% of the minuscule particles that cause COVID-19. Plymouth Meeting's ECRI tested some from a New Jersey hospital that worried nurses.

Michael Rose, a section chief in U.S. Immigration and Customs Enforcement’s global trade division, has been investigating a wide variety of covid-related scams over the past year. Of all those cases, he says, the flood of fake 3M masks from China has been the most consistent. (Photo courtesy of U.S. Customs and Border Protection/TNS)
Michael Rose, a section chief in U.S. Immigration and Customs Enforcement’s global trade division, has been investigating a wide variety of covid-related scams over the past year. Of all those cases, he says, the flood of fake 3M masks from China has been the most consistent. (Photo courtesy of U.S. Customs and Border Protection/TNS)Read moreU.S. Customs and Border Protecti