“In recent years, park officials have observed a rise in illegal drone activity, which they attribute to the increasing affordability and availability of consumer drones. In response, Yosemite has expanded signage at park entrances and key visitor areas to remind the public of drone restrictions. During the current government shutdown, there have been sporadic reports of unauthorized drone use. Law enforcement rangers are responding to incidents as they arise.” Source: Excerpted from an email from the Park Service Public Affairs office, commenting on the increase in illicit drone activity in the National Park system.