  The extremely small branching ratio of $b\to ss{\bar d}$ decay in the
Standard Model makes it a suitable channel to explore new-physics signals. We
study this $\Delta S=2$ process in Randall-Sundrum models, including the
custodially protected and the bulk-Higgs Randall-Sundrum models. Exploring the
experimentally favored parameter spaces of these models, it suggests a possible
enhancement of the decay rate, compared to the Standard Model result, by at
most two orders of magnitude.
