Texas Occupations Code - OCC § 2310.059. Testing by Department

(a) The department shall from time to time measure an amount of motor fuel that is kept or offered for sale, sold, or in the process of delivery, to determine:

(b) If the department finds that any lot of motor fuel contains less of the motor fuel than the amount represented, the department may seize the motor fuel as evidence.

(c) A person commits an offense if the person or the person's employee or agent refuses to exhibit motor fuel being sold or offered for sale at a given quantity, or ordinarily sold in that manner, to the department for testing and proving as to quantity.