Ah, thanks. Not sure how it applies to Terri, though, since legally she was not considered to be imprisoned. Have habeus corpus procedings ever been brought in cases where the person in question was held by someone other than the state (e.g. in child custody disputes)?
Not sure about that but,
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"The writ may be used in civil matters to challenge a person's custody of a child or the institutionalization of a person declared incompetent."
From the same source as above.