  Angular distributions of a B meson decaying into two vector mesons are
discussed with emphasis on time evolution effects on the complete set of
amplitude bilinears. Time integrated quantities are suggested to observe
substantial CP violation in decays with charm quarks in the final state
particles. Relations among the nine observables at $t=0$ are found to be useful
for a consistency check of experimentally extracted quantities. Numerical
estimates of the nine observables are made using form factor models and the
assumption of the factorization hypothesis. Branching ratio asymmetries for
B_u^+ -> D^{*+} \bar D^{*0} and B_d -> D^{*+} D^{*-} can be as large as -3% and
-4%, respectively.
