It's an interesting question, hypothetically speaking. It's sort of similar to the question of whether or not you can fly over a park where drones are forbidden. You can takeoff/land outside the park, cross the park boundary, and overfly the park. You just can't be standing inside the park yourself to fly your drone. The FAA controls the airspace above the park, and the park controls who is allowed to stand inside the park.The pilot's location is irrelevant to what rules apply. The controlling law is that in the jurisdiction where the aircraft is.
It's not exactly the same scenario though, unless we get back into the debate of "where the aircraft is". Is the drone in the park, or in FAA airspace?
But, let's say you're standing in Mexico and choose to fly your drone across the Rio Grande into US territory. The drone will likely be instantly vaporized by missiles fired from Predator/Reaper drones operated by Homeland Security to patrol the border. But you might be perfectly safe standing on the Mexican side of the fence, unless the Federales catch you. Either way, it sounds like a really bad idea. They have geese too, eh.