This chapter applies to every person that employs one or more minors, or who permits, allows, or suffers one or more minors to work at a site or workplace, on premises, or under work conditions controlled by that employer, except for those employers statutorily exempted, as follows: This chapter does not apply to newspaper vendors or carriers; to domestic or casual labor in or about private residences; to parents or stepparents who employ their own children for house-to-house sales; to agricultural labor as defined by RCW 50.04.150; or, to employers expressly exempted by federal statute from the coverage of state law.