W. Va. Code § 19-16A-15

Any applicator, whose certificate has been suspended, revoked or modified or if significant technological developments have occurred requiring additional knowledge related to the classification or subclassification for which the applicator has applied, or when required by additional standards established by the United States environmental protection agency, or when required by rules of the commissioner, is required to be reexamined or to take special examinations and furnish satisfactory evidence of completion of educational courses, programs or seminars approved by rules relating to applicator's certification.