34 Tex. Admin. Code § 25.123
The correctness of this affidavit must be certified by an official of the employer where the service was rendered. This can be done by the superintendent, business manager, certified reporting official, secretary of the school board, or treasurer of the school board at the time the certification is made. The certification must be based upon the existing records maintained by the employer and must be in the form prescribed by TRS for this purpose. TRS shall determine whether the verified service or compensation is eligible for TRS purposes. For a charter holder or charter school that is no longer in operation, verification shall be made by the Texas Commissioner of Education or the custodian designated under 19 TAC § 100.1203(b) (relating to Records Management).
34 Tex. Admin. Code § 25.123