W. Va. Code § 16A-7-4: Laboratory.

(a) A grower and processor shall contract with an independent laboratory to test the medical cannabis produced by the grower or processor. The bureau shall approve the laboratory and require that the laboratory report testing results in a manner as the bureau shall determine, including requiring a test at harvest and a test at final processing. The possession by a laboratory of medical cannabis shall be a lawful use.

(b) All medical cannabis produced pursuant to this chapter shall be subject to testing as directed by the bureau.

(c) The bureau shall ensure that there is sufficient testing capacity to meet patient demand.

(d) All laboratories providing testing pursuant to this section shall be certified to do so by the Office of Laboratory Services.