  Supersymmetric models with nonuniversal down type squark masses can enrich
the chiral structure and CP violating phenomena in $b\to s\gamma$ decays.
Direct CP violation in $b\to s \gamma$, mixing induced CP violation in
radiative $B_{d,s}$ decays (such as $B_s\to \phi \gamma$ and $B_d \to
K^*_{1,2}\gamma$), and $\Lambda$ polarization in $\Lambda_b \to \Lambda \gamma$
can be substantially different from the Standard Model. Future experiements at
$e^+ e^-$ and hadronic B factories will give important information on the
underlying theory for radiative $b$ decays.
