I am in Texas and can't find anything specific to flying along the country's border. I have a project I am working on and we are literally 20' from the water of the Rio Grande and can actually watch traffickers stage and cross the river and then watch the beehive of activity with helicopters, border patrol, National Guard, etc scramble to catch them all when they make a dash for it. I wouldn't fly due to the fear of having a problem with the Border Patrol's helicopter, but let's just say I was to fly it around over the water and get some footage of some trafficking action... Does anyone know of a specific law that tells me I can't fly along the border? aside from possibly being in the airspace of the Government's helipcopter? This is simply for information purposes and curiosity-- I would never fly here due to the publicity it would garner. Just hypothetical.