You are adept at offering effortless, entirely false justifications for being somewhere you shouldn’t be, or doing something you shouldn’t be doing. When you are caught, make a Charm Test, Opposed by your target’s Cool. If you pass, your preposterous explanation convinces them for one Turn (or minute, depending on the situation) per SL you achieved on the Opposed Test. If you achieved a number of SL greater than your target’s Willpower Bonus, they remain convinced until someone else points out the incongruity in your explanation.

Core Book, Page 115