False Positive (How I Met Your Mother)

"**False Positive**"
"False Positive"
How I Met Your Mother episode
Episode no.	Season 6; Episode 12
Directed by	Pamela Fryman
Written by	Craig Gerard; Matthew Zinman;
Production code	6ALH12
Original air date	December 13, 2010
Guest appearances
	Chris Romano as Punchy; Alex Trebek as himself; Ben Vereen as Sam Gibbs; Melissa Molinaro as Noelle;
Episode chronology
← Previous; "The Mermaid Theory"	Next →; "Bad News"
	How I Met Your Mother season 6
	List of episodes

"False Positive" is the 12th episode of the sixth season of the CBS sitcom How I Met Your Mother, and the 124th episode overall. It aired on December 13, 2010. It features guest star Alex Trebek.