  Supersymmetric (SUSY) theories include many new parameters, some of which are
CP-violating. Assuming that SUSY is found at a future high-energy collider, we
examine the decay stop2 -> stop1 tau- tau+ with an eye to obtaining information
about the new CP phases. We show that there are two CP-violating asymmetries
which can be large in some regions of the SUSY parameter space. These involve
measuring one or both of the tau spins. These asymmetries are particularly
sensitive to phi_At, the phase of the trilinear coupling A_t.
