  Beauty baryons are being observed in large numbers in the LHCb detector. The
rich kinematic distributions of their multibody decays are therefore becoming
accessible and provide us with new opportunities to search for CP violation. We
analyse the angular distributions of some three- and four-body decays of
spin-$1/2$ baryons using the Jacob-Wick helicity formalism. The asymmetries
that provide access to small differences of CP-odd phases between decay
amplitudes of identical CP-even phases are notably discussed. The understanding
gained on processes featuring specific resonant intermediate states allows us
to establish which asymmetries are relevant for what purpose. It is for
instance shown that some CP-odd angular asymmetries measured by the LHCb
collaboration in the $\Lambda_b \to \Lambda\,\varphi \to p\,\pi\, K^+ K^-$
decay are expected to vanish identically.
