Documents obtained by "The Washington Post" and the ACLU showed that Sanchez authorized the use of military dogs, temperature extremes, reversed sleep patterns, and sensory deprivation as interrogation methods in Abu Ghraib. A November 2004 report by Brigadier General Richard Formica found that many troops at the Abu Ghraib prison had been following orders based on a memorandum from Sanchez, and that the abuse had not been carried out by isolated "criminal" elements. ACLU lawyer Amrit Singh said in a statement from the union that "General Sanchez authorized interrogation techniques that were in clear violation of the Geneva Conventions and the army's own standards."