  We present a summary of recent results on CP violation and mixing in the
charm quark sector based on a high statistics sample collected by
photoproduction experiment FOCUS (E831 at Fermilab). We have measured the
difference in lifetimes for the $D^0$ decays: $D^0 \to K^-\pi^+$ and $D^0 \to
K^-K^+$. This translates into a measurement of the $y_{CP}$ mixing parameter in
the $\d0d0$ system, under the assumptions that $K^-K^+$ is an equal mixture of
CP odd and CP even eigenstates, and CP violation is negligible in the neutral
charm meson system. We verified the latter assumption by searching for a CP
violating asymmetry in the Cabibbo suppressed decay modes $D^+ \to
K^-K^+\pi^+$, $D^0 \to K^-K^+$ and $D^0 \to \pi^-\pi^+$. We show preliminary
results on a measurement of the branching ratio $\Gamma(D^{*+}\to \pi^+
(K^+\pi^-))/\Gamma(D^{*+}\to \pi^+ (K^-\pi^+))$.
