The Marshals use both traditional methods and sophisticated
technologies for fugitive investigations, including tactical equipment,
electronic surveillance and aerial surveillance. Tactical equipment
includes covert audio and video alarms and sensors; digital, narrowband,
encrypted wireless communications; and radio and satellite
communications equipment, such as tactical repeaters, base stations and
portable tower trailers.
The U.S. Marshals Service, which has served the United States since 1789, is the oldest—and by some accounts, the most versatile—federal law enforcement agency. It serves as the enforcement arm of the federal courts and is therefore involved in nearly all federal law enforcement initiatives.