RCW 80.04.280

No public service company shall permit any employee to sell, offer for sale, or solicit the purchase of any security of any other person or corporation during such hours as such employee is engaged to perform any duty of such public service company; nor shall any public service company by any means or device require any employee to purchase or contract to purchase any of its securities or those of any other person or corporation; nor shall any public service company require any employee to permit the deduction from his or her wages or salary of any sum as a payment or to be applied as a payment of any purchase or contract to purchase any security of such public service company or of any other person or corporation.