Wash. Rev. Code § 69.04.780
The director shall cause the investigation and examination of food, drugs, devices, and cosmetics subject to this chapter. The director shall have the right (1) to take a sample or specimen of any such article, for examination under this chapter, upon tendering the market price therefor to the person having such article in custody; and (2) to enter any place or establishment within this state, at reasonable times, for the purpose of taking a sample or specimen of any such article, for such examination.
The director and the director's deputies, assistants, and inspectors are authorized to do all acts and things necessary to carry out the provisions of this chapter, including the taking of verified statements. Such department personnel are empowered to administer oaths of verification on the statements.
RCW 69.04.780