A mini lie detector routine you can carry with you at all times! A perfect close up mentalism routine!
Detection is designed as a (fictitious) detective board game card.
"The object of the game", the performer explains, "is to find out when your opponent is lying and which crime they've selected."
The participant is asked to mentally select any one of the twelve crimes listed on the card. They are then instructed to tell the performer some details about their crime, but to lie to the performer once during this process, any time they choose!
Despite the impossible conditions, the performer is always able to reveal the selected crime and when the participant lied!