West Virginia Code Chapter 4. The Legislature § 4-1A-6. Scope of legislative immunity generally

(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.