Smugglers are increasingly using drones to drop drugs over the U.S-Mexico border.
Border Patrol is using six blimps that can detect low-flying aircraft using specialized radar, CBS News reports.  The drones are monitored by Tethered Aerostat Radar System (TARS), which can cover the entire boarder.
“Our law enforcement operators that see that on the radar and get the drugs, get the bad guys that are waiting for the drugs,” said Rob Brown the TARS program manager
To fly below the radar, smugglers often fly dangerously low.
“They’ll hug the mountains really close just to try and break up their profile,” said Brent J. Smart, an Air and Marine Interdiction Agent.
The TARS technology helps agents find drugs that are dropped from the sky.