(NBC News) Seconds after the radio crackled and the government SUVs sped into the darkness, Border Patrol agents sprinted through the brush and toward the border in an all-too-familiar pursuit of drug smugglers.
"They dropped their bundles of narcotics and went back into Mexico," said agent Marlene Castro, sounding disappointed after racing through a pitch-black clearing outside Rio Grande City. Still, on this recent night, agents would recover 66 pounds of marijuana with a street value of roughly $53,000.
But chasing drug smugglers wasn't the only thing keeping them busy.
Advertisement - story continues below