  The longitudinal polarization of fermions (tops and taus) produced in
sfermion decays to neutralinos or charginos can be a useful tool for the
determination of SUSY parameters. We discuss this fermion polarization in the
context of the MSSM with complex parameters. We show that the dependence on
CP-violating phases can be large and that the fermion polarization may hence be
used as a sensitive probe of CP phases in the MSSM.
