  In this letter we seek to redress lingering misconceptions pertaining to the
physicality of the chiral phase of Dirac bi-spinor fields. Demonstrably, the
most general first-order partial differential equation for spinor wavefunctions
that can be obtained in Minkowski spacetime is the Dirac-like equation which
leaves both the mass and chiral angles as free parameters, the so-called Chiral
Dirac Equation. Previously, claims have plauged the literature which assert
that any attempt to incorporate chirality by such a generalization can be
trivially reduced to the case the nominal Dirac Equation. These statements are
incorrect. In this letter we present a formal proof demonstrating the physical
non-equivalence of particle states whose chiral angles differ, thereby
demonstrating unequivocally the physicality of the chiral basis.
