 Conversely, neither the U.S. Congress nor the U.S. Constitution has such a rule so riders which are completely unrelated to the main bill are commonplace.These amendments are often put into bills at the last minute, so that any representative who may read the legislation before actually voting on it will not have a chance to catch it.An effort is underway, however, to add a single subject amendment to the U.S. Constitution to apply a single subject rule to the Congress.