[pgrote]

"Why did the NPS restrict unmanned aircraft? The National Park Service embraces many activities in national parks because they enhance visitor experiences with the iconic natural, historic and cultural landscapes in our care. However, due to serious concerns about the negative impact that flying unmanned aircraft can have for safety of visitors, staff, and wildlife, they have been restricted in all but a few parks."

[mtanski]

I meant that you'll find incidents like the guy "landing" his drone into the hot springs in Yellowstone. A lot more along these lines.