Opper v. United States

Background

A Chicago subcontractor and a government employee at an Air Force laboratory were accused in a scheme involving the approval and purchase of survival goggles. The employee recommended previously rejected goggles for use in government kits. Records show a long‑distance call, airline tickets, and a $1,000 check; the subcontractor later gave written and oral statements to the FBI saying the money was a loan and denying guilt. They were tried together and the jury convicted the subcontractor on counts tied to paying the employee.

Reasoning

The central question was whether statements the accused made after the alleged crime need independent support before a jury can rely on them. The Court held that admissions made after the crime — even statements meant to explain or deny guilt — are like confessions in their risk of error and therefore require substantial independent corroboration. That corroboration must be evidence, separate from the defendant’s statements, that makes those statements trustworthy and supports the essential facts the statements assert. The Court found records and testimony here sufficiently corroborated payment and the employee’s actions to permit conviction. The Court also rejected the claim that trying both men together required reversal because the judge gave clear instructions and there was no showing of specific prejudice.

Real world impact

Federal prosecutions that rely on a defendant’s out‑of‑court explanations will now need substantial independent evidence to support those statements. Prosecutors must produce items like records or eyewitness proof to back post‑offense admissions. Defendants cannot be convicted solely on their own after‑the‑fact statements, and courts may still order joint trials when no clear prejudice appears.

Dissents or concurrances

Justice Frankfurter agreed with the result; Justice Douglas would have reversed, favoring a stricter rule requiring corroboration that proves the crime as a whole.