Tex. Transportation Code § 521.044

(a) Information provided on a driver's license or personal identification certificate application that relates to the applicant's social security number may be used only by the department or disclosed only to:

(1) the child support enforcement division of the attorney general's office;

(2) another state entity responsible for enforcing the payment of child support;

(3) the United States Selective Service System as provided by Section 521.147;

(4) the unclaimed property division of the comptroller's office;

(5) the Health and Human Services Commission;

(6) the secretary of state for the purposes of voter registration or the administration of elections; or

(7) an agency of another state responsible for issuing driver's licenses or identification documents.

(b) The department shall enter an applicant's social security number in the department's electronic database but may not print the number on the applicant's driver's license or personal identification certificate.

(c)(1) On the request of a state entity responsible for investigating or enforcing the payment of child support or the secretary of state, the department shall disclose information regarding an applicant's social security number.

(2) On the request of the Health and Human Services Commission and for the purpose of assisting the commission in determining an applicant's eligibility for any program administered by the commission, the department shall disclose information regarding an applicant's social security number.

(d) Information disclosed under this section may be used by a state entity responsible for enforcing the payment of child support only to implement the duties of the state entity.

(e) The department shall include in the department's legislative appropriations requests and budgets, in quarterly performance reports, and in audits of the department's local offices performance measures on the percentage of complete and correct social security numbers on driver's licenses and personal identification certificates.

(f) This section does not prohibit the department from requiring an applicant for a driver's license to provide the applicant's social security number.