The line between truth and deception is thin, and you cross it with ease.

Encounter   ✦     Martial
Free Action      Personal

Prerequisite: You must have training in Bluff.

Trigger: You make a Bluff check and dislike the result.

Effect: You reroll the Bluff check and must use the second result.

Update (9/30/2011)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 119, Class Compendium.