Information about drone operations in the United States of America can be found on the pages of the Federal Aviation Administration.
The FAA seperates the regulations into several categories for easy access.
- Public Operations (Governmental)
- Civil Operations (Non-Governmental)
- Model Aircraft (Hobby or Recreation only)
The use of drones in National parks has been banned.
Here is the official page on the regulation of drones in US National parks by the NPS.