Cal. Civ. Code § 1667 : CALIFORNIA CIVIL CODE — OBLIGATIONS — CONTRACTS — UNLAWFUL CONTRACTS — Generally TEXT PDF That is not lawful which is: 1. Contrary to an express provision of law; 2. Contrary to the policy of express law, though not expressly prohibited; or, 3. Otherwise contrary to good morals. Ca. Civ. Code § 1667 Enacted 1872.