Legislative immunity extends to legislative staff, aides or assistants working on behalf of a legislator. Inquiry is prohibited into things done as a legislator's staff member, aide or assistant which would have been legislative acts if performed by the legislator personally.
W. Va. Code § 4-1A-12
Legislative acts of legislative staff, aides or assistants
Official source: West Virginia Legislature. Reproduced from public-domain West Virginia statutes; confirm against the official source for the current text. Not legal advice.