Ariz. Rev. Stat. § 28-5648
A. The department, or its appointees, including federal government employees or persons operating under contract with this state, on presenting appropriate credentials may conduct inspections and remove samples of fuel to determine coloration of diesel fuel, or to identify shipping paper violations at any place where taxable fuel is or may be produced, stored or loaded into transport vehicles. Inspections shall be performed in a reasonable manner consistent with the circumstances, but in no event is prior notice required. Inspectors may physically inspect, examine or otherwise search any tank, reservoir or other container that can or might be used for the production, storage or transportation of fuel. Inspection may be made of any equipment used for, or in connection with, the production, storage or transportation of fuel. Inspectors may demand that shipping papers, documents and records required to be kept by a person transporting fuel be produced for immediate inspection. The places that may be inspected pursuant to this section include: