A letter from the OLC providing legal advice regarding the continued use of sleep deprivation on a detainee. It concludes that continued use would be consistent with all applicable law, and that "the continuation of the technique … would be in close service of a highly important governmental need." Although the technique is not specifically named, based on the reference to footnote 7 of page 8 of the July 20, 2007 memo, the technique being discussed is sleep deprivation.