Ideas on New Experiments on Polarized Target

A possible application of polarized proton targets and polarized proton and antiproton beams to the direct testing of $T$, $P$, $C$ invariance and the $\mathrm{CPT}$ theorem is considered. Procedure for direct determination of the $T$-violated amplitude $T$ from experimental data is given. Deviations from symmetry properties for polarization tensors in elastic scattering due to the bremsstralung effect are considered. The $P$ invaraiance can be tested both in the up-down asymmetry measurement and in the total cross-section measurements using the polarized beam and the polarized target. The measurement of the total polarization cross section ${\sigma }_{p1p2\mathrm{}}$ is of interest for testing higher isotopic symmetries.