A new report from the Justice Department's Inspector General reveals the FBI has spent more than $3 million on drone operations since 2006.
Some civil liberties groups say domestic drone use invades people's privacy. But the Inspector General's report found the FBI only operated drones after getting all of the required approval.
In a letter sent to Sen. Rand Paul, R-Ky., the FBI revealed it had used drones 10 times since 2006 for surveillance in kidnappings, search and rescue missions, and drug and fugitive investigations.
Among them was the standoff with Jimmy Lee Dykes, who was shot to death after holding a 5-year-old boy hostage in an underground bunker in Alabama.
The Bureau of Alcohol, Tobacco, Firearms and explosives also plans to start using drones to support future operations.