(a) A person commits an offense if the person:
(1) refuses to permit inspection of animals under Section 161.048 of this code; or
(2) fails to stop a truck, trailer, wagon, or automobile suspected of carrying animals or animal products if requested or signaled to do so by an agent of the commission.
(b) An offense under this section is a Class C misdemeanor unless it is shown on the trial of the offense that the defendant has been previously convicted under this section, in which event the offense is a Class B misdemeanor.