Posted: 12:35 PM ET
WASHINGTON (CNN) The contentious debate over so-called "enhanced interrogation techniques" took center stage on Capitol Hill Wednesday as a former FBI agent involved in the questioning of terror suspects testified that such techniques including waterboarding are ineffective.
Ali Soufan, an FBI special agent from 1997 to 2005, told members of a key Senate Judiciary subcommittee that such "techniques, from an operational perspective, are ineffective, slow and unreliable, and harmful to our efforts to defeat al Qaeda."
His remarks followed heated exchanges between committee members with sharply differing views on both the value of the techniques and the purpose of the hearing itself.
Soufan, who was involved in the interrogation of CIA detainee Abu Zubaydah, took issue with former Vice President Dick Cheney, who has argued that enhanced interrogation techniques helped the government acquire intelligence necessary to prevent further attacks after September 11, 2001.
The techniques, which were approved by the Bush administration, are considered torture by many critics.
"From my experience and I speak as someone who has personally interrogated many terrorists and elicited important actionable intelligence I strongly believe that it is a mistake to use what has become known as the 'enhanced interrogation techniques,'" Soufan noted in his written statement.
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