Abstract
It is shown that the existence of a DELTA I = 1/2 rule for SIGMA decay can be neither proven nor disproven. This inability results from an ambiguity in the signs of certain of the interaction Hamiltonian matrix elements. It is noted that in strong interactions (such as non-mesonic hypernuclei decay) these signs become unambiguous, but that other difficulties arise. (T.F.H.)
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