  We propose a candidate Compton amplitude which is valid for any (integer)
quantum spin and free from any spurious poles. We consider the cases of
electromagnetism and gravity. We obtain such amplitudes by calculating the
corresponding ones from superstring theory involving states on the leading
Regge trajectory. To extract the associated field-theory amplitudes a few
considerations in the form of simple physical constraints are required, such
as: Soft momentum transfer, compactification of polarizations and consistent
factorization in the physical channels. We believe the present exploration will
be significantly relevant for the physics of compact binary systems with spin.
