  We present our study of CP violation in two-body weak decays of antitriplet
charmed baryons. In the standard model, the $\Delta c =1$ quark level
interactions inducing CP violation for the relevant decays can be grouped into
two types, one proportional to the CKM matrix elements $\lambda_d=
V_{ud}V^*_{cd}$ and another $\lambda_b = V_{us}V^*_{cs}$. Recent studies have
shown that with $SU(3)_F$ flavor symmetry, the decay amplitudes, including
their strong phases, can be determined by data if contributions from
$\lambda_b$ are neglected. However, the $\lambda_b$ terms must be retained to
create interferences that induce CP violation. Some of them can be recovered in
the framework of $SU(3)_F$ flavor symmetry, and the CP-violating rate asymmetry
$A_{CP}$ is predicted to be of the order of ${\cal O}(10^{-4})$. We find that
final state re-scattering effects, which link hadronic matrix elements
proportional to $\lambda_d$ and $\lambda_b$, can help recover the missing
terms. The re-scattering effects can enhance CP violation by an order of
magnitude, with $A_{CP} (\Xi_c^0 \to p K^-) - A_{CP} (\Xi_c^0 \to \Sigma^+
\pi^-)$ being as large as $1.87 \times 10^{-3}$. This makes it promising to
observe CP violation for the first time in baryon decays.
