Secret Service agents also investigate counterfeiting, the forgery of government checks or bonds, and the fraudulent use of credit cards. Various other Federal agencies employ police and special agents with sworn arrest powers and the authority to carry firearms. These agencies include the US Forest Service under the Department of Agriculture, the National Park Service under the Department of the Interior, and Federal Air Marshals under the Department of Transportation. Other police agencies generally evolved from the need for security for the agency's property and personnel. The largest such agency is the General Services Administration's Federal Protective Service, which provides security for Federal buildings and property nationwide.
Police work can be very dangerous and stressful.
In addition to the obvious dangers of confrontations with criminals, the need to be constantly alert and ready to deal appropriately with any situation can be very stressful. Shift work is necessary because police protection must be provided around the clock. Junior officers frequently must work weekends, holidays, and nights. Special agents are subject to call at any time their services are needed and may work long hours during investigations. All agents are required to file reports of their activities, often involving long hours of paperwork.