Tenn. Code Ann. § 67-3-816: Inspections

(a) In addition to any general authority to investigate for violations of this chapter, the commissioner and the commissioner's designees are hereby authorized to inspect any motor vehicle to ascertain whether the fuel supply tank contains dyed diesel fuel or diesel fuel contaminated with dye.

(b) The commissioner may assess a civil penalty of one thousand dollars ($1,000) against a person who refuses to allow the inspection. For subsequent refusals, the penalty shall be multiplied by the total number of separate refusals by that person.