The HyperCP experiment (E871) at Fermilab has collected the largest sample of hyperon decays in the world. With a data set of over a million ????? ??? ??????? decays we have measured the product of ???????? from which we have extracted ????. This preliminary result indicates that ???? is small, but non???zero. Prospects for a test of CP symmetry by comparing the ?? parameters in ????? and ????+ decays will be discussed. ?? 2003 American Institute of Physics