The FDA is investigating a fake supply of the anti-cancer drug Avastin that made its way into U.S. doctors’ offices and medical clinics. The agency does not believe anyone was harmed by the counterfeit product. And it sought to reassure the American public about the safety of the medicines we take. But the fake-Avastin case follows similar ones involving the cholesterol drug Lipitor, a popular weight-loss pill and Viagra. And it has heightened concern that counterfeit medicine is a growing problem in the U.S. An estimated 80 percent of the active ingredients in U.S. medicines comes from overseas, making regulation more difficult. Diane and her guests talk about keeping the U.S. drug supply safe.