US lawNorth DakotaConstitutionArticle I18N.D. Const. art. I, § 18ND Const., Article I, Section 18Length: 19 wordsOfficial source No bill of attainder, ex post facto law, or law impairing the obligations of contracts shall ever be passed.PreviousN.D. Const. art. I, § 17NextN.D. Const. art. I, § 19