But transcripts of the police interrogations show that he was, as his father calls him, "the golden witness".
Yet leaked transcripts of their interrogations show that Mr Oz grilled them about several books, including one written by a former police chief, Hanefi Avci, which also attacks the Gulenists.
Later, Ali Reza Afshar, the deputy head of the Iranian armed forces, said that if the interrogations showed that the men "didn't have any bad intention, they will be released soon".
Even before Mr. Obama released secret memorandums on the interrogation techniques approved by the Bush administration, Mr. Cheney, as part of researching his memoir, had asked the National Archives to declassify two other documents he contends would show that harsh interrogations produced useful information, according to his daughter Liz, who is helping him organize and write the memoir.
At a news conference today, the National Police spokesman, Inspector General Saleh Saaf, said that the interrogation showed that Mr. Bashir was, "involved in many of Faruq's plots".
An edited transcript of the interrogation shows that the agents asked him repeatedly to explain why he had failed a polygraph examination administered a month earlier.
In it, Mr. Morsi appears to have cited confessions obtained by his Islamist supporters, the advocates said, when he promised that confessions under interrogation would show that protesters outside his palace acknowledged ties to his political opposition and had taken money to commit violence.
The C.I.A. has said that the two interrogations shown in the videotapes occurred in 2002, and that the taping of interrogations stopped that year.
Mr. Dixon, one of Mr. Khan's lawyers, said Saturday that the admission that officials had destroyed videotapes of interrogations showed why such an order was needed.
Studies show that interrogations of a suspected liar should always be performed in his/her mother tongue as even expert speakers of a foreign language will not show the same reactions (in spoken language as well as body language) if questioned in a language acquired later in life.
During any future trial, Mr. Marri's lawyers could show a jury interrogation tapes showing that he had been treated roughly.
