premise: Because LSC attorneys must withdraw whenever a question of a welfare statute's validity arises, an individual could not obtain joint representation so that the constitutional challenge would be presented by a non-LSC attorney, and other, a504(a)(16) is necessary to define the scope and contours of the federal program, a condition that ensures funds can be spent for those cases most immediate to congressional concern.
hypothesis: LSC attorneys are required by law to withdraw whenever a question arises.