From Time Magazine:
For weeks, U.S. and Salvadoran counternarcotics officials had been watching a boat they suspected was ferrying drugs to and from El Salvador's Pacific coast. But to be sure, they needed a plane that could stay aloft over the ocean, undetected, long enough to get detailed surveillance imaging. So last month the Defense Department's Southern Command (Southcom) suggested this would be a good opportunity to help determine whether an unmanned air vehicle (UAV) being tested at El Salvador's Comalapa Air Base might be the future of drug interdiction.
Read more ....
My Comment: One of the many new applications that will be developed as drones become more sophisticated and reliable in providing intelligence.