Border Patrol uses drones to scan borders for illegal immigrants . Report says they only patrol 170 miles of the 1,993 mile border . `` We could never see the border in the same way we could before we got these ... '' Reports say the return on investment is n't worth it .
Border Patrol uses drones to scan borders for illegal immigrants . Report says they only patrol 170 miles of the 1,993 mile border . Reports say the return on investment is n't worth it .