No plea in abatement or plea of non est factum shall be received unless it be verified by affidavit. And in all cases, including those wherein the defendant is a corporation, the plea in abatement may be pleaded and verified by the attorney or agent of the defendant.
W. Va. Code § 56-4-32
Same -- Verification of plea in abatement and of non est factum; may be pleaded and verified by attorney or agent of defendant
Official source: West Virginia Legislature. Reproduced from public-domain West Virginia statutes; confirm against the official source for the current text. Not legal advice.