The treaty commits states to a ban on the testing of nuclear weapons, and establishes the Comprehensive Nuclear‐Test‐Ban Treaty Organization to ensure that the provisions of the treaty are implemented. Negotiated in the early 1990s, by February 2008 it had been signed by 178 nations, and ratified by 144. The United States signed the treaty, but the Senate rejected the treaty in 1999 and the administration of George W. Bush was opposed to the treaty. Other states known to have nuclear weapon programmes, such as India, Israel, North Korea, and Pakistan, have not signed. See also Nuclear Non‐Proliferation Treaty.
http://pws.ctbto.org/ Site of the Preparatory Commission for the Comprehensive Nuclear‐Test‐Ban Treaty Organization.