This story has been in the news today. More people are using drones to take pictures in Yosemite, and the NPS is not thrilled.
For Death Valley visitors, here are the park regulations about aircraft and other manmade things that fly. When I first began frequenting DV in the mid 80s, there was a sign at Dante's View saying "No Hang Gliding Air Deliveries." Today, the issues are different but the principle is the same: to protect public safety and park features and resources, and ensure the most enjoyable experience for everyone.