Abu Zubaydah ( ( listen) AH-boo zuu-BAY-d@; Arabic: bw zbyd@, Abu Zubaydah; born March 12, 1971, as Zayn al-Abidin Muhammad Husayn) is a Saudi Arabian citizen currently held by the U.S. in the Guantanamo Bay detention camp in Cuba.

In early July 2002 the Associate General Council CTC/Legal Group started drafting a memo to the Attorney General requesting the approval of "aggressive" interrogation methods, which otherwise would be prohibited under the provisions of Section 2340-2340B, Title 18, United States Code, on Abu Zubaydah. This memo, drafted by Office of Legal Counsel, Jay Bybee and his assistant John Yoo, is also referred to as the first Torture Memo. Addressed to CIA acting General Counsel John A. Rizzo at his request, the purpose of the memo was to describe and authorize specific enhanced interrogation techniques to be used on Zubaydah. On July 26, 2002 Deputy Assistant Attorney General John Yoo informed the CIA that Attorney General John Ashcroft had approved waterboarding of Abu Zubaydah.  Journalists including Jane Mayer, Joby Warrick and Peter Finn, and Alex Koppelman have reported the CIA was already using these harsh tactics before the memo authorizing their use was written, and that it was used to provide after-the-fact legal support for harsh interrogation techniques. A Department of Justice 2009 report regarding prisoner abuses reportedly stated the memos were prepared one month after Zubaydah had already been subjected to the specific techniques authorized in August 1, 2002, memo. John Kiriakou stated in July 2009 that Zubaydah was waterboarded in the early summer of 2002, months before August 1, 2002, memo was written.  The memo described ten techniques which the interrogators wanted to use: "(1) attention grasp, (2) walling, (3) facial hold, (4) facial slap (insult slap), (5) cramped confinement, (6) wall standing, (7) stress positions, (8) sleep deprivation, (9) insects placed in a confinement box, and (10) the waterboard." Many of the techniques were, until then, generally considered illegal. Many other techniques developed by the CIA were held to constitute inhumane and degrading treatment and torture under the United Nations Convention against Torture and Article 3 of the European Convention on Human Rights.  As reported later, many of these interrogation techniques were previously considered illegal under U.S. and international law and treaties at the time of Zubaydah's capture. For instance, the United States had prosecuted Japanese military officials after World War II and American soldiers after the Vietnam War for waterboarding. Since 1930, the United States had defined sleep deprivation as an illegal form of torture. Many other techniques developed by the CIA constitute inhuman and degrading treatment and torture under the United Nations Convention against Torture, and Article 3 of the European Convention on Human Rights.

Using a quote from the above article, answer the following question: Did the CIA get useful information from these techniques?