In the United States v. Cook case of 1965, the Supreme Court ruled on a matter concerning federal income tax evasion. The defendant, Mr. Cook, was charged with willfully attempting to evade or defeat his income taxes for three years by filing false and fraudulent returns that understated his taxable income significantly. He argued that he had not been given enough time to prepare for trial after receiving copies of his net worth statements from the prosecution team just two weeks before proceedings began. The court held in favor of the government stating that there was no violation of Rule 16 (which requires prosecutors to provide defendants with relevant documents) because it does not mandate providing such data at any specific time prior to trial; rather it only necessitates provision upon request by defense counsel which occurred here. Furthermore, they found no evidence suggesting prejudice against Mr.Cook due to this timing issue as he did not ask for a continuance nor did he claim inability to adequately prepare his defense within given timeframe.

In the dissenting opinion for United States v. Cook, it was argued that the majority's decision to uphold Cook's conviction under Section 145(b) of the Internal Revenue Code was incorrect. The dissenting justices believed that there was insufficient evidence to prove beyond a reasonable doubt that Cook had willfully attempted to evade or defeat his income tax. They pointed out inconsistencies in the government’s case and emphasized on its reliance on circumstantial evidence which they deemed as inadequate proof of guilt. Furthermore, they contended that even if one were to accept all of this indirect evidence at face value, it still would not establish an affirmative act constituting an attempt at evasion as required by law. Therefore, according to them, upholding such a conviction based on weak and inconsistent evidences undermined fundamental principles of justice and fairness.