Abstract
The spin one theory of Takahashi and Palmer [4] leads to acausal propagation when minimally coupled to an electromagnetic field. The addition of an anomalous magnetic moment (Pauli term) allows one to recover causal propagation. In the case of the Rarita-Schwinger spin 3 2 theory it is impossible to obtain causal propagation even when all possible Pauli terms are included. Coupling of a massive spin 1 2 and massive spin 1 theory leads to causal propagation for all nonderivative vector and tensor couplings, pseudo scalar and pseudo vector couplings.
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