  The deflection of gamma-rays in Earth's gravitational field is tested in
laser Compton scattering at high energy accelerators. Within a formalism
connecting the bending angle to the photon's momentum it follows that detected
gamma-ray spectra are inconsistent with a deflection magnitude of 2.78 nrad,
predicted by Einstein's gravity theory. Moreover, preliminary results for 13-28
GeV photons from two different laboratories show opposite - away from the beam
line - deflection, amounting to 33.8-0.8 prad. These conclusions, however, are
applicable only for gravitationally sterile high energy electrons. Much more
subtle effects are expected if the gravitational deflection of the electrons is
taken into account.
