W. Va. Code § 19-16A-16: Employee training program.

A licensee shall register with the commissioner any employee who performs pest control within thirty days after employment. The employee must have successfully completed training approved by the department. An employee who has not successfully completed training may only apply pesticides if a certified applicator is physically present at the time and place the pesticide is applied. The commissioner shall adopt rules that establish the criteria for approved training programs for such registered technicians.