Unarmed drones could solve the Mexican border question quickly and cheaply... No need for Hadrians Wall...no alligators in moots...!
An eye in the sky...with infrared for night vision...would pin point EXACTLY where the illegals are...and "patrolling" would become obsolete over night...! Just a matter of pick up and detention... Arming drones with stun grenades and a loudspeaker...could deter many and force them to turn back...with no use of manpower on the border...it could literally be done from anywhere...
But of course...this is all too logical to even be considered...!
