No bill of attainder, ex post facto law, nor any law impairing the obligation of contracts, shall ever be passed

Okla. Const. art. II, § 15 — under Bill of Rights.

Okla. Const. art. II, § 15

No bill of attainder, ex post facto law, nor any law impairing the obligation of contracts, shall ever be passed

No bill of attainder, ex post facto law, nor any law impairing the obligation of contracts, shall ever be passed. No conviction shall work a corruption of blood or forfeiture of estate: Provided, that this provision shall not prohibit the imposition of pecuniary penalties.