Ariz. Rev. Stat. § 3-3453
A. A person shall not serve as a public weighmaster or deputy weighmaster unless the person is issued a public weighmaster or deputy weighmaster license by the division in accordance with practices and procedures to be established by the associate director. An applicant for a public weighmaster or deputy weighmaster license shall:
E. Except as otherwise provided in subsection G of this section, the certified weighing of any property, livestock or commodity shall be performed only by a public weighmaster or deputy weighmaster. The following persons are not required to obtain licenses as public weighmasters or deputy weighmasters: