34 Tex. Admin. Code § 31.12
A person who is receiving a service retirement annuity who retired after January 1, 2001, forfeits the annuity for any month in which the retiree is employed by a public educational institution covered by TRS, except in the cases set forth in §31.13 of this chapter (relating to Substitute Employment), §31.14 of this chapter (relating to One-half Time Employment), §31.15 of this chapter (relating to Six Month Exception), §31.16 of this chapter (relating to the Acute Shortage Area Exception), §31.17 of this chapter (relating to the Principal/Assistant Principal Exception), and §31.18 of this chapter (relating to the Bus Driver Exception).
Source Note:The provisions of this §31.12 adopted to be effective March 12, 2003, 28 TexReg 2109.