The government attempts to maintain top secrecy regarding bills debated; MPs generally receive copies of bills only a few days before they are debated, and newspapers are rarely provided with copies of the bills before they are debated. In some cases, such as a 1968 amendment to the Constitution, an MP may be presented with a bill to be debated on the same day it is tabled, and all three readings may be carried out that day itself. In rare circumstances, the government may release a White paper containing particular proposals that will eventually be incorporated into a bill; this has been done for legislation such as the Universities and University Colleges Act.