  For any new physics possibly emerging in the future B experiments, the
problem is how to extract the signals from the SM background. We consider the
decay $b\to s s\bar d$ which is very small in the SM. In the MSSM this decay is
possibly accessible in the future experiments. In the supersymmetric models
with R-parity violating couplings, this channel is not strictly constrained,
thus being useful in obtaining bounds on the lepton-number violating couplings.
A typical candidate for the suggested search is the $B^-\to K^-K^-\pi^+$ mode.
