Lawrence Berkeley National Laboratory

Non-conservation of CP symmetry can manifest itself in non-lepton ichyperon decays as a difference in the decay parameter between the strange-baryon decay and its charge conjugate. By comparing the decay distribution in the $\Lambda$ helicity frame for the decay sequence $\Xi- \to \Lambda \pi-$,$\Lambda \to p \pi-$with that of $\overline Xi+$ decay, E756 at Fermilab did not observe any CP-odd effect at the $10-2$ level. The status of a follow-up experiment, HyperCP (FNAL E871), to search for CP violation in charged $\Xi-\Lambda$ decay with a sensitivity of $10-4$is also presented.