Does Jay Leno use swear words during his standup routines in Vegas?

We all know comics who are perfectly clean when they go on national TV but then turned foul mouthed when they do comedy specials on HBO or gigs in Vegas. Robin Williams, Whoopie Goldberg, and Rosie O'Donnell are three such examples and some of the most foul mouthed comedians on earth when not on national TV. I was wondering if Jay Leno is the same way? Clean on the Tonight Show, F words in Vegas? Any other "clean" comedians you know who swear like hell during other gigs?