In the United States v. Weller case of 1970, the Supreme Court dealt with issues related to tax evasion and fraud. The defendant, Mr. Weller, was accused of evading taxes by not reporting income from his business operations in Mexico and Panama between 1957-1961. He argued that he did not have to report this income because it was earned outside U.S territory and therefore exempt under Section 911(a)(1) of the Internal Revenue Code which excludes foreign earned income from gross taxable income for US citizens residing abroad. However, the court ruled against him stating that while Section 911 does provide an exclusion for certain types of foreign-earned incomes; it is only applicable if a taxpayer can prove they are a bona fide resident or physically present in a foreign country during most part of any period within their fiscal year as defined by IRS regulations. The court found that Mr.Weller failed to meet these requirements since he spent significant time in California managing his businesses rather than living abroad permanently or temporarily during those years when unreported earnings were made overseas. Therefore, all such earnings should have been reported as part of his gross taxable income according to U.S law leading to conviction on charges brought against him.

The dissenting opinion in the United States v. Weller case argued that the majority's decision to uphold a conviction based on evidence obtained through warrantless searches was unconstitutional. The dissenters believed that this ruling violated Fourth Amendment protections against unreasonable searches and seizures, as well as Fifth Amendment rights to due process of law. They contended that allowing such practices would set a dangerous precedent for future cases, potentially undermining citizens' constitutional rights and eroding public trust in law enforcement agencies. Furthermore, they expressed concerns about potential abuses of power by authorities if left unchecked by judicial oversight or legal safeguards. In their view, upholding fundamental civil liberties should take precedence over prosecutorial convenience or expediency in criminal investigations.