Va. Code § 3.2-5221
No inspector of milk or cream, and no person in any milk inspection laboratory, shall manipulate the Babcock or other centrifugal machine for the purpose of determining the composition of milk or cream for purposes of inspection without first obtaining a certificate from the Commissioner that he is competent to perform such work. No person in any milk depot, ice cream factory, confectionery, creamery, cheese factory, condensed milk factory, or other place in the Commonwealth shall manipulate the Babcock or other centrifugal machine for the purpose of determining the composition or value of milk or cream, or shall take samples or weigh milk or cream, as a basis for payment in buying or selling, without first obtaining a certificate from the Commissioner that he is competent to perform such work. All such certificates shall be renewed annually without further examination at the discretion of the Commissioner upon application. Unless a person holding a valid tester's, weigher's, and sampler's certificate renews his certificate within one year after its expiration date, he shall be required to pass the applicable examination before a new certificate shall be issued. If any holder of a certificate is notified by the Commissioner to correct his use of a Babcock or other centrifugal machine, or his method of sampling or weighing, and the person or holder of a certificate notified fails to comply with the notice and correct his use of a Babcock or other centrifugal machine, or his methods of sampling or weighing, he shall be deemed guilty of a violation of the provisions of this article, and the Commissioner may forfeit his certificate or assess a civil penalty as provided in § 3.2-5233. No holder of a certificate whose authority to manipulate a Babcock or other centrifugal machine or to sample or weigh milk or cream has been revoked by the Commissioner shall thereafter manipulate in the Commonwealth any centrifugal machine or sample or weigh milk or cream for the purposes herein specified until his certificate has been renewed.
Va. Code § 3.2-5221