In the 1906 case of Guy v. Donald, the United States Supreme Court addressed a dispute over land ownership in Florida. The plaintiff, Guy, claimed that he had purchased a parcel of land from the state of Florida and was therefore its rightful owner. However, the defendant, Donald, argued that this purchase was invalid because at the time it took place (in 1845), Florida did not have clear title to sell as it had only recently become a U.S. territory and federal law required all public lands to be surveyed before they could be sold or granted away by states. The court ruled in favor of Donald on two grounds: firstly because there were no records proving that any surveying had been done prior to Guy's alleged purchase; secondly because even if such evidence existed it would still not establish his claim since under Spanish law (which governed Florida until its acquisition by America) private individuals couldn't acquire unsurveyed public lands without royal permission which wasn't proven either. Therefore according to both American and Spanish laws applicable at different times in history for this particular piece of land - neither supported Guy's claim making him lose his case against Donald.

In the dissenting opinion for the case of Guy v. Donald, it was argued that there was a lack of sufficient evidence to prove that Mr. Guy had intentionally and knowingly violated any laws regarding his business operations as an insurance agent in Washington D.C., which were regulated by Congress under its constitutional authority over federal territories. The dissenting justices believed that Mr. Guy's actions did not constitute fraud or deceit, but rather stemmed from a misunderstanding or misinterpretation of complex regulatory requirements imposed on his industry by lawmakers. They also disagreed with the majority's interpretation of these regulations, arguing they were overly broad and vague in their definition of what constituted illegal conduct for insurance agents operating within federal jurisdictions like D.C.. Therefore, they felt it was unjust to penalize Mr.Guy based on such ambiguous legal standards without clear proof he intended to break them.