  We propose that the cascade decay $\Lambda_b \to D(\to K^+\pi^-) N(\to
p\pi^-)$ may serve as the discovery channel for baryonic CP violation. This
decay chain is contributed by, dominantly, the amplitudes with the intermediate
$D$ state as $D^0$ or $\bar{D}^0$. The large weak phase between the two kinds
of amplitudes suggests the possibility of significant CP violation. While the
presence of undetermined strong phases may complicate the dependence of CP
asymmetry, our phenomenological analysis demonstrates that CP violation remains
prominent across a broad range of strong phases. The mechanism also applies to
similar decay modes such as $\Lambda_b \rightarrow D(\rightarrow K^+ K^-)
\Lambda$. Considering the anticipated luminosity of LHCb, we conclude that
these decay channels offer a promising opportunity to uncover CP violation in
the baryon sector.
