It isn't just on the Canadian border.  Druggies are using GPS drops to deliver their product in Tucson, and probably in Phoenix as well, although I have no direct information about the Phoenix area.

Bill
  ----- Original Message ----- 
  From: Regan Smith 
  To: listserv@azgeocaching.com 
  Sent: Friday, January 24, 2003 6:45 AM
  Subject: Re: [Az-Geocaching] Geocaching and National Security


  I know on the Canada border Drug drops are sent via GPS Coords