At the federal level alone, the polygraph is used extensively in counter-intelligence, counter-terrorism, and counter-narcotics programs in addition to criminal investigations, intelligence operations, presidential protection and nuclear materials containment. There are at least 68 countries world-wide where the polygraph is used for similar applications. The FBI, CIA, U.S. Secret Service and the National Security Agency are just some of the government agencies which use polygraph testing for a variety of subject matters and issues.
In the private sector, polygraph is used extensively by individuals, families, therapists, attorneys, courts, business and many other entities. Just some of the entities which use polygraph testing are: