Not everything was destroyed:

The videotapes, which a judge has ordered the government to produce, are expected to reveal al Qahtani’s condition toward the end of three months of intensive solitary confinement and isolation just before the special interrogation plan was implemented. In a letter to his superiors, FBI Deputy Assistant Director T.J. Harrington described al Qahtani at the time as “evidencing behavior consistent with extreme psychological trauma (talking to non-existent people, reportedly hearing voices, crouching in a corner of the cell covered with a sheet for hours on end).”

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