A comprehensive test ban treaty, or CTBT, is the oldest item on the nuclear arms control agenda. These treaties currently limit testing to underground only, with a maximum force equal to 150,000 tons of TNT. Since 1997, the United States has held 22 "subcritical experiments" at the Nevada Test Site, asserting that these experiments do not violate the CTBT because they cannot produce a self-sustaining chain reaction. The Senate rejected the CTBT on October 13, 1999, and the current Administration under President George W. Bush has indicated that it will continue to oppose the CTBT, will continue to adhere to the test moratorium, is considering modifying existing warheads for use against hard and deeply-buried targets, has not ruled out resumed testing, and has no plans to test.

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