In Roper v. United States, the Supreme Court ruled on a case involving the interpretation of federal tax law and its application to an individual's income from selling timberland. The petitioner, Roper, had sold some land with valuable standing timber for a price that included both the value of the land and the timber. He argued that he should only be taxed on his profit from selling the actual land because he was not in business as a lumber dealer or processor but rather as a farmer who occasionally sold off parcels of his farm which happened to contain valuable trees. However, according to Internal Revenue Code Section 631(b), gains derived from cutting timber are considered taxable income if you're engaged in logging operations or regularly sell cut logs. The court disagreed with Roper's argument and held that profits made by him were subject to taxation under section 631(b) regardless of whether he was primarily engaged in farming activities or not. This decision affirmed lower courts' rulings stating that all proceeds received by Mr.Roper constituted ordinary income under federal tax laws.

In the dissenting opinion for Roper v. United States, the justice argued that there was a lack of clear evidence to support the majority's decision. The dissent focused on two main points: first, it questioned whether or not Roper had actually waived his right to appeal; and secondly, it challenged the notion that he had knowingly committed perjury during his trial. Regarding waiver of appeal rights, they pointed out that no written record existed showing this waiver and thus doubted its validity. On perjury charges, they believed there was insufficient proof to demonstrate beyond reasonable doubt that Roper intentionally lied under oath - instead suggesting he may have been confused or mistaken in his testimony due to stress or other factors related with being on trial for serious crimes. They concluded by expressing concern over what they saw as an erosion of defendants' rights in favor of prosecutorial convenience and efficiency.