"Except for the exchange of personal opinion or medical speculation, there is no evidence of constitutional study or consideration. Only Chief Justice Burger attempted to anchor the discussion in the Constitution, expressing the patent federalism objection that "the states have,..., as much concern in this area as in any within their province; federal power has only that which can be traced to a specific provision of the Constitution." [Memorandum to the Conference from Warren Burger, dated May 31, 1972]. There is little other argument or discussion in the internal correspondence touching upon the substance of constitutional law."