When did the sixth season premiere of the show whose 12th episode of that season is called "False Positive"?
False Positive (How I Met Your Mother): "False Positive" is the 12th episode of the sixth season of the CBS sitcom "How I Met Your Mother", and the 124th episode overall. How I Met Your Mother (season 6): The sixth season of the American television comedy series "How I Met Your Mother" premiered on September 20, 2010, and concluded on May 16, 2011 on CBS.
September 20, 2010