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