A schematic experiment is described to search, via the reaction ${\nu }_{\mu }+p\to {\nu }_{\mu }+n+{\pi }^{+}$, for a neutral hadronic weak current, either isovector or isotensor, coupled to a neutral leptonic weak current. The analysis of the experiment makes use of the equality of the cross sections for $n+p\to n+n+{\pi }^{+}$ and $n+p\to p+p+{\pi }^{-}$, dictated by charge symmetry, and is capable of obtaining, at least in principle, an upper limit of less than 1% on the ratio $\frac{\sigma ({\nu }_{\mu }+p\to {\nu }_{\mu }+n+{\pi }^{+})}{\sigma ({\nu }_{\mu }+p\to {\mu }^{-}+p+{\pi }^{+})}.$

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