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The official also would not say whether any techniques had to change because of the new order, saying telegraphing what techniques are or aren’t used could give terrorists a chance to train against them.

The official declined to say whether the rules would exclude the practice of water boarding. That technique, decried by many critics, involves simulated drowning by wrapping the subject’s face with cellophane and pouring water over him. The official did say the prohibition against extreme heat or cold would rule out induced hypothermia, which Mr. Anders at the ACLU said they believe was one of the more commonly used tactics.