Tex. Gov't Code § 305.0021
(a) If a registrant, or a person on the registrant's behalf and with the registrant's consent or ratification, joins with another person to make an expenditure described by this chapter, the amount of the expenditure made by or on behalf of the registrant for purposes of this chapter includes only:
(2) the amount of any portion of the joint expenditure that:
Added by Acts 2007, 80th Leg., R.S., Ch. 1253 (H.B. 2735), Sec. 1, eff. September 1, 2007.
Acts 2013, 83rd Leg., R.S., Ch. 1231 (H.B. 2984), Sec. 1, eff. September 1, 2013.