There's nothing confidential about what happened. They were suspicious because we were doing low-level mapping in Big Bend National Park (for the NPS). We were being tracked by the Marfa balloon. I guess we must have disappeared from radar a few times as well as lingering in the area for about an hour (?). Obviously they suspected drugs so they dispatched a Citation from ABQ. I decided to land for fuel in Roswell. How they figured this out, I'm not sure, but we landed, they landed, and tower told us to follow the Citation to parking. I had no idea even though they had asked us to hold on the runway for a minute or two (unusual). They asked to look in the airplane but the minute they stepped onto the wing to look inside they knew they were mistaken. They were actually apologetic and a bit sheepish.