(a) Affidavit. To purchase gasoline or diesel fuel
less the state tax and not prepay the liquefied gas tax for vehicles
equipped to use liquefied gas, a commercial transportation company
that provides transportation services to a public school district
in Texas must submit to the comptroller an affidavit stating:
  (1) that the company has contracted with a specific
public school district to provide transportation services (other than
charter trips) for the school district;
  (2) that motor fuel purchased tax-free will be used
exclusively by the company to provide the transportation services
for the school district; and
  (3) the vehicle identification number and vehicle license
plate number for each vehicle equipped to use liquefied gas to furnish
transportation services exclusively to public school districts in
Texas.