  The experiment E865 at BNL places an upper limit on the branching ratio for
the decay K+ -> pi+ mu+ e- of 3.9x10^-11 (90% C.L.). Along with with other
results this yields a combined upper limit on this branching ratio of
2.8x10^-11. A new upper limit on the branching ratio for pi0 -> mu+ e- of
3.8x10^-10 (90% C.L.) is also established. The experiment and analysis are
described.
