Washington Revised Code Title 49. Labor Regulations § 49.62.070. Employees having an additional job--When authorized

(2)(a) This section shall not apply to any such additional services when the specific services to be offered by the employee raise issues of safety for the employee, coworkers, or the public, or interfere with the reasonable and normal scheduling expectations of the employer.

(b) This section does not alter the obligations of an employee to an employer under existing law, including the common law duty of loyalty and laws preventing conflicts of interest and any corresponding policies addressing such obligations.