Interacting Rarita-Schwinger Field

To avoid the mutual inconsistency between interaction, quantization, and subsidiary conditions of the Rarita-Schwinger spin-$\frac{3}{2}$ field, an additional subsidiary field is introduced in the spirit of the Stückelberg formalism. Relativity is violated in the time development of the subsidiary field, but no observable consequences seem to follow. The unwanted states are removed invariantly from the asymptotic states through a Gupta-Bleuler kind of subsidiary condition. Energy has a positive-definite expectation value in the physical states.