W. Va. Code § 21-3E-4: Employers may test current and prospective employees for drugs or alcohol.

It is lawful for an employer to test employees or prospective employees for the presence of drugs or alcohol, in accordance with the provisions of this article, as a condition of continued employment or hiring. However, in order to qualify for a bar from being subjected to legal claims for acting in good faith on the results of a drug or alcohol test, employers must adhere to the accuracy and fairness safeguards outlined in this article.