I know Alpha Tau Omega does, based on this thread:
http://forums.greekchat.com/gcforums...threadid=46512
However, it looks like this was a very special case. I think an ATO would need to answer this further.
http://forums.greekchat.com/gcforums...&threadid=2527 was another case of a fraternity PNAM, but the original poster never said what happened with it.