Why Are Polygraphs Used?

The primary purpose of the polygraph test in security screening is to identify individuals who present serious threats to national security. To put this in the language of diagnostic testing, the goal is to reduce to a minimum the number of false negative cases (serious security risks who pass the diagnostic screen).

Are polygraphs still used by police?

And yet polygraphs are still routinely used by government agencies and law enforcement.

Why does the FBI still use polygraphs?

The FBI uses polygraph examinations for five primary purposes: pre-employment screening, personnel security screening, counterintelligence and counterterrorism investigations, criminal investigations, and administrative investigations. ... Individuals that consent to undergo a polygraph examination must do so in writing.