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Charles S. Phalen Jr., the FBI's assistant director for security, said the polygraph is a vital component of the bureau's security program.
"This is the most effective collection tool that we have in our arsenal of security tools to identify disqualifying behavior and disqualifying activities," Phalen said. "I will never sit here and say this is a perfect tool because it's not. . . . In and of itself it won't produce the truth, but it's a way at getting at the truth."
