(a) Every person engaged in the business of buying milk or cream on the basis of, or in any way with reference to, the amount of butterfat contained therein or on the basis of tests made for official inspection or public record shall have the samples taken for testing purposes either by a licensed tester or by a person licensed or certified to weigh and sample milk and cream.
(b) For the purpose of this subchapter, a person certified to weigh and sample milk or cream is any person who, having furnished satisfactory evidence of good character and having passed a satisfactory examination in weighing and sampling milk and cream conducted by the Department of Agriculture or its agents, has received a certificate of proficiency from the Department.
(c) Each applicant for an examination for such certificate shall pay a fee of $1.75 to the Department. The Department shall issue a certificate of proficiency in the name of the approved applicant and under a serial number. The Department of Agriculture upon receipt of this certificate of proficiency, together with the payment of a fee of $3.45, shall issue a license to the applicant good for 1 calendar year. This license shall be renewed annually without further examination at the discretion of the Department of Agriculture upon the payment of $3.45.
(d) Each licensed weigher and sampler shall post his or her license in plain view in the plant in which he or she is employed. The Department of Agriculture may revoke the license for failure to post it as above mentioned or for any other just cause.