Tex. Transp. Code § 521.063
The department by rule shall establish a system to ensure that addresses of driver's license holders are verified and matched to United States Postal Service delivery addresses by use of address-matching software. The software must meet certification standards under the Coding Accuracy Support System adopted by the United States Postal Service or a subsequent standard adopted by the United States Postal Service to replace Coding Accuracy Support System standards for preparation of bulk mailings. If the department contracts with a provider for bulk mailing services, the contract must require that the provider use address-matching software that meets or exceeds certification standards under the Coding Accuracy Support System or subsequent standards adopted by the United States Postal Service.
Tex. Transp. Code § 521.063