So I've been watching Season 1 of Battlestar Galactica (just finished episode 9 Tigh Me Up Tigh Me Down--don't spoiler me past this point please!) and I think I've invented a more efficient Cylon detector
than the one Gaius Baltar is using that takes 11 hours per one blood sample.
Gaius has to sleep with anyone suspected of being a Cylon (oh you know he would!) and--making sure the Cylon-suspect is on top--videotapes the encounter to see if the candidate's spine gets all red glowy from the sexual action.
Done. I've saved the universe.