Former FDA Commissioner: China Should Have Blood Samples From Sick Wuhan Lab Workers, Where Are They? Would constitute "pretty definitive proof that this coursed through that lab" Image Credit: Email Appearing on CBS News’ ‘Face The Nation’ Sunday, former FDA Commissioner Scott Gottlieb pointed out that “definitive” proof that a coronavirus outbreak occurred in the Wuhan lab could be found in blood samples from workers who are now known to have fallen sick and been hospitalised in November 2019. When asked if he believes China knows where the virus really originated, Gottlieb replied “They would know the answer to the question because they would have blood samples from the workers in that lab.”