No bill of attainder, ex post facto law, retroactive law, or any law impairing the obligation of contracts, shall be made.
Official text of the Texas Constitution as published by the Texas Legislative Council.
Texas Constitution › Article 1
Texas Constitution Art. I, § 16
Bills of Attainder; Ex Post Facto or Retroactive Laws; Impairing Obligation of Contracts
Bill of Rights
Legislative history
(Feb. 15, 1876.)