  We study partial rate asymmetry in decays with single isospin final state.
For K meson or hyperon decays, the partial rate asymmetries are always zero if
the final states are single isospin states. In B decays the situation is
dramatically different and partial rate asymmetries can be non-zero even if the
final states are single isospin states. We calculated partial rate asymmetries
for several B decays with single isospin amplitude in the final states using
factorization approximation. We find that in some cases the asymmetries can be
large.
