Bills on the table

[M.B.E.]

In Las Vegas and L.A. cardrooms, hundred-dollar bills on the table are considered in play and may be placed in the pot instead of chips. Also it's pretty common to be asked to sell chips to another player for various reasons.

Are counterfeit bills a legitimate concern in this context? Or am I just being paranoid?

From time to time you hear about the vulnerability of U.S. money to counterfeiting (e.g. http://www.post-gazette.com/localnew...unterfeit7.asp).