Section 18.370.020 - Minors prohibited-Proof of age(1) Persons under eighteen years of age are prohibited from using an ultraviolet tanning device without a written prescription for ultraviolet radiation treatment from a physician licensed under chapter 18.57 or 18.71 RCW.(2) Proof of age must be satisfied with a driver's license or other government-issued identification containing the date of birth and a photograph of the individual.