(a) Legislative immunity, affording protection under the Separation of Powers Doctrine and the Speech or Debate privilege, extends to all of a legislator's legislative acts, as defined in section three of this article.(b) The Speech or Debate privilege, when it applies, is absolute and has two aspects:(1) A member of the Legislature has immunity extending both to civil suits and criminal prosecutions for all actions within the legislative sphere, even though the conduct, if performed in other than a legislative context, would in itself be unconstitutional or otherwise contrary to criminal or civil statutes; and(2) A member of the Legislature is provided a testimonial privilege that operates to protect those to whom it applies from being compelled to give testimony as to privileged matters and from being compelled to produce privileged documents.
West Virginia Legal Code