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We study a relation between the weak phase $\gamma$ and the rates and CPasymmetries of several $K \pi$ decays of $B^+$, $B^0$, and $B_s$, emphasizingthe impact of the latter measurements. Current data indicate large SU(3)breaking in the strong phases or failure of factorization (including itsapplication to penguin amplitudes) in $K \pi$ modes of $B^0$ and $B_s$. SU(3)and factorization only remain approximately valid if the branching ratio for$B_s \to K^- \pi^+$ exceeds its current value of $(5.27 \pm 1.17) \times10^{-6}$ by at least 42%, or if a parameter $\xi$ describing ratios of formfactors and decay constants is shifted from its nominal value by more thantwice its estimated error.

Examination of Flavor Symmetry in $B, B_s \to K \pi$ Decays