  Recent studies about the impact of the CP-violating complex parameters in
supersymmetry on the decays of third generation squarks and about T-odd
asymmetries in neutralino and chargino production and decay are reviewed. The
CP-even branching ratios of the third generation squarks show a pronounced
dependence on the phases of A_t, A_b, mu and M_1 in a large region of the
supersymmetric parameter space. This could have important implications for stop
and sbottom searches and the MSSM parameter determination in future collider
experiments. We have estimated the expected accuracy in the determination of
the parameters by global fits of measured masses, decay branching ratios and
production cross sections. We have found that the parameter A_t can be
determined with an error of 2 - 3%, whereas the error on A_b is likely to be of
the order of 50 - 100%. In addition we have studied CP-odd observables, like
asymmetries based on triple product correlations, which are necessary to
unambiguously establish CP violation. We have analysed these asymmetries in
neutralino and chargino production with subsequent three-body decays at the
International Linear Collider with longitudinally polarised beams in the MSSM
with complex parameters M_1 and mu. The asymmetries, which appear already at
tree-level because of spin correlation between production and decay, can be as
large as 20% and will therefore be an important tool for the search for
CP-violating effects in supersymmetry.
