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There are several theories or processes which may underlie quantum mechanicsand make it deterministic. Some references are given in the main text. Any suchtheory, plus a number of reasonable assumptions, implies the existence of whatI have called ``special" states. The assumptions are conservation laws,obedience (up to a point) of Schrodinger's equation, and a single world, in thesense of the many worlds interpretation (the last one a consequence of anydeterministic theory). This article also, for clarity, gives an example of a``special" state. There is an experimental test of the ``special" state theory.

Need for "special" states in a deterministic theory of quantum mechanics