Wolfle v. United States

Background

A man on trial for a crime had dictated a letter to his wife through a stenographer who took notes and later read from them in court. The trial judge admitted the stenographer’s testimony, and the conviction was upheld by the Court of Appeals, which applied a local statute. The case reached the high Court to decide whether that testimony could be used despite rules protecting private communications between husband and wife.

Reasoning

The Court explained that federal courts should apply common-law principles, not only old local statutes, when deciding who may testify. The core question was whether a private communication to a spouse stays protected if the speaker voluntarily tells a third person. The Court said marital confidentiality exists to protect marriage, but that protection ends when the speaker voluntarily shares the communication with a third person. Because the accused had disclosed the letter’s contents to a stenographer, the communication was no longer treated as a protected marital secret, and the stenographer’s testimony was admissible.

Real world impact

The decision means that people who share otherwise private conversations or letters with someone outside the marriage risk losing legal protection for those communications. It makes clear federal courts will look to common-law principles in the absence of controlling federal law. The Court did not decide every possible situation—such as whether a spouse’s own testimony would be treated the same—and left some related questions open for future cases.