  It has recently been argued that half degrees of freedom could emerge in
Lorentz and parity invariant field theories, using a non-linear Proca field
theory dubbed Proca-Nuevo as a specific example. We provide two proofs, using
the Lagrangian and Hamiltonian pictures, that the theory possesses a pair of
second class constraints, leaving $D-1$ degrees of freedom in $D$ spacetime
dimensions, as befits a consistent Proca model. Our proofs are explicit and
straightforward in two dimensions and we discuss how they generalize to an
arbitrary number of dimensions. We also clarify why local Lorentz and parity
invariant field theories cannot hold half degrees of freedom.
