W. Va. Code § 48-2-303: Prohibition against marriage not to include persons related by adoption.

For the purpose of section 2-302, cousin or double cousin does not include persons whose relationship is created solely by adoption. If it necessary to open and examine the record of any adoption proceeding in the state to ascertain that a relationship of cousin or double cousin is created solely by adoption, then an application may be made to the circuit court that held the adoption proceeding, by the clerk of the county commission seeking to issue the marriage license, or either party applying for the license, to open the record and cause it to be examined. Upon such application, the judge shall examine the record confidentially and report to the clerk whether the record discloses any consanguinity prohibited by this section and may grant such other relief prayed for which may be proper under article 22 of this chapter.