  We define a CP sensitive asymmetry in the sfermion decays $\ti f \to f
\ti\chi^0_j \ell \bar \ell, f \ti\chi^0_j q \bar q$, based on triple product
correlations between the momenta of the outgoing fermions. We study this
asymmetry in the MSSM with complex parameters. We show that the asymmetry is
sensitive to the phases of the parameters $\mu$ and $M_1$. The leading
contribution stems from the decay chain $\ti f\to f \ti\chi^0_j\to f
\ti\chi^0_1 Z\to f \ti\chi^0_1 \ell \bar \ell (f \ti\chi^0_1 q \bar q)$, for
which we obtain analytic formulae for the amplitude squared. The asymmetry can
go up to 3% for $\ti f\to f \ti\chi^0_1 \ell \bar \ell$, and up to 20% for $\ti
f\to f \ti\chi^0_1 q \bar q$. We also estimate the rates necessary to measure
the asymmetry.
