First Measurements of polarization in Charmless B to Vector Vector decays at CDF

We study samples of $B^0\to\phi K^{\ast 0}$ and $B^0_s\to\phi \phi$ collected in approximately 400 pb-1 of CDF run II data to measure the longitudinal and transverse polarization in these b-s penguin dominated decays. Comparison with analogous B-factories measurement and prospect for future developments are also given.