  We address the issue of consistent interactions for off-shell fermion fields
of arbitrary spin. These interactions play a crucial role in the quantum
hadrodynamical description of high-spin baryon resonances in hadronic
processes. The Rarita-Schwinger description of high-spin fermion fields
involves unphysical degrees of freedom, associated with their lower-spin
content. These enter the interaction if not eliminated outright. The invariance
condition of the interaction under the unconstrained Rarita-Schwinger gauge
removes the lower-spin content of the fermion propagator and leads to a
consistent description of the interaction. We develop the most general,
consistent interaction structure for high-spin fermions. We find that the power
of the momentum dependence of a consistent interaction rises with the spin of
the fermion field. This leads to unphysical structures in the energy dependence
of the computed cross sections when the short-distance physics is cut off with
standard hadronic form factors. A novel, spin-dependent hadronic form factor is
proposed that suppresses the unphysical artifacts.
