Earlier quoted context omitted.
This is the border in Arizona, south of Sierra Vista. I often drive the international road and rarely see anyone else...not even border patrol. One does not need a catapult. http://postimage.org/image/wtie29yrb/
Are drones patrolling the area from above?
[edit] it's an aerostat, not a blimp: Fort Huachuca is about fifteen miles to the north and "is home to a radar-equipped aerostat, one of a series maintained for the Drug Enforcement Administration by Lockheed Martin. The aerostat is based northeast of Garden Canyon and, when extended, supports the DEA drug interdiction mission by detecting low-flying aircraft attempting to penetrate the United States."