(a) The service shall adopt rules that conform to but are not more strict than current good manufacturing practices as established under 21 U.S.C. Section 360b for the use of drugs in the manufacture, processing, and packaging of commercial feed unless the service determines that those practices are not appropriate to conditions existing in this state.
(b) A person commits an offense if the person violates a rule adopted under Subsection (a). An offense under this section is a Class C misdemeanor unless it is shown that the person has previously been convicted of an offense under this subchapter, in which event it is a Class B misdemeanor.