Established the contract law principle caveat emptor in the United States. Decided March 15, 1817. Opinion of the Court: John Marshall → go there Topic: Businesses/Corporations/Contracts. Laidlaw v. Organ, 15 U.S. 178 (1817), is a case decided by the Supreme Court of the United States that established the rule that buyers need not disclose advantageous information to sellers. This rule should not be confused with either caveat emptor—a rule placing the burden of due diligence on the purchaser of goods—or caveat venditor—the rule that vendor sales come with an implied warranty. Wiki link