I've read about something that got nicknamed the "hush puppy" that might have been in the CIA category. Supposedly it was a Smith 9mm tuned to work with a silencer and subsonic ammo (long before the current 147 gr loads became popular). The couple references I've seen to it claimed it got its name because it was intended to put down guard dogs before they could alert or do damage.

Also, again from readings, I don't think that the ASP was any kind of CIA weapon. What I've read suggests that it was created as a Secret Service weapon for protection details in embassies and the like where they had to blend in by dressing formally (i.e. tuxes and similar wear).