For purpose of determining whether the rules adopted pursuant to RCW 69.07.020, as now or hereafter amended are complied with, the department shall have access for inspection purposes to any part, portion or area of a food processing plant, and any records required to be kept under the provisions of this chapter or rules and regulations adopted hereunder. Such inspection shall, when possible, be made during regular business hours or during any working shift of said food processing plant. The department may, however, inspect such food processing plant at any time when it has received information that an emergency affecting the public health has arisen and such food processing plant is or may be involved in the matters causing such emergency.