If a light gaugino sector exists, then the lightest supersymmetric par
ticle (LSP) has a chance of being pair-produced in rare B-decays. As a
consequence of neutral flavour violation in most supersymmetric model
s, such decays can occur at the tree-level and reinforce the B --> K(K
-) + invisible channels. We discuss how a study of such decay spectra
in B-factories can help us either identify or exclude a light LSP.