Tex. Bus. & Com. Code § 622.152
This chapter does not prohibit a sweepstakes sponsor, after a winner has been chosen, from:
(2) obtaining from an individual chosen as a winner an affidavit to verify that the individual:
Added by Acts 2007, 80th Leg., R.S., Ch. 885 (H.B. 2278), Sec. 2.01, eff. April 1, 2009.