It is ungrammatical. "
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GPYIt is ungrammatical. Possibly you mean "What would it do or not do to a person?"
AnonymousWhat would it not do to a person?Yes, it is OK. Obviously, generally speaking, it is more usual to ask what something does rather than what it does not do, since the latter category is normally rather open-ended. However, the sentence is OK as far as the English is concerned.