  In the present paper, the leading-order post-Newtonian spin-orbit and
spin(1)-spin(2) radiation-reaction Hamiltonians are calculated. We utilize the
canonical formalism of Arnowitt, Deser, and Misner (ADM), which has shown to be
valuable for this kind of calculation. The results are valid for arbitrary many
objects. The energy loss is then computed and compared to well-known results
for the energy flux as a check.
