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Recent experimental results on $B\to\rho\rho$ decays indicate that the CPasymmetry $S_{\rho^+\rho^-}$ will give an interesting determination of$\alpha=\arg[-(V_{td}V_{tb}^*)/(V_{ud}V_{ub}^*)]$. In the limit when the $\rho$width is neglected, the $B\to\pi\pi$ isospin analysis can also be applied to$B\to\rho\rho$, once an angular analysis is used to separate transversitymodes. The present bound on the shift of $S_{\rho^+\rho^-}$ from the true$\sin2\alpha$ is already stronger than it is for $S_{\pi^+\pi^-}$. We point outa subtle violation of the isospin relations when the two $\rho$ mesons areobserved with different invariant masses, and how to constrain this effectexperimentally.Comment: 12 pages, minor change

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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