Violation of time reversal invariance in K0 decays

A T -odd correlation observed in the decay K{sub L}{r_arrow}{pi}{sup +}{pi}{sup {minus}}e{sup +}e{sup {minus}} has been cited as direct evidence of time-reversal violation (TRV). Here it is argued that when CP violation is due to K{sup 0}{ovr K{sup 0}} mixing it is doubtful that any decay experiment by itself can provide direct evidence for TRV. {copyright} {ital 1999} {ital The American Physical Society }