  We propose a local model for general fermionic systems, which we express in
the Heisenberg picture. To this end, we shall use a recently proposed
formalism, the so-called "Raymond-Robichaud" construction, which allows one to
construct an explicitly local model for any dynamical theory that satisfies
no-signalling, in terms of equivalence classes of transformations that can be
attached to each individual subsystem. By following the rigorous use of the
parity superselection rule for fermions, we show how this construction removes
the usual difficulties that fermionic systems display in regard to the
definition of local states and local transformations.
