Implications of b->s gamma in the Weinberg three-Higgs-doublet models

Using recent experimental measurements on Br(b-->s gamma) from CLEO, we study the constraints on the charged Higgs sector in various three-Higgs-doublet models. Some phenomenological implications in these models with emphasis on CP violation are presented. In particular, in some of these models, the CP violating muon polarization in K-mu 3 can be detected using the current KEK experiment E246.