text:  The court's ruling could have ripple effects across the federal government, where agencies frequently use highly trained experts to interpret and implement federal laws. Although the doctrine was relatively non-controversial when it was first introduced in 1984, in recent years conservatives, including some members of the Supreme Court, have called for it to be overruled. Again, Landmark Legal Foundation, of which I am chairman, has filed a brief, a friend of the court brief, in this case as well.