Extensions of the scalar sector of the Standard Model (SM) can provide the needed new sources of CP violation. The ATLAS and CMS collaborations have just started probing C-even CP violating neutral Higgs-fermion Yukawa couplings of the top quark and of the tau lepton. Signals of P-even CP violation, are purely bosonic, and rely on the simultaneous observation of three processes, involving at least one extra scalar, still to be discovered. Even without direct observation of a new scalar, the most general triple Z-boson vertex has a P-even CP-violating term that is nonzero in CP-violating extensions of SM. The three processes involving the new scalars, give a non-zero contribution to this form factor. Hence, there is potential for detecting loop-induced P-even, CP-violating phenomena at the LHC even if the kinematics do not allow for direct detection.