Smith v. Arizona

In Arizona, Jason Smith was tried on drug and weapons charges. At trial, the prosecution called a forensic expert who testified about DNA test results from evidence samples, despite the fact that the actual testing and analysis had been performed by another analyst who did not testify. Smith objected, arguing that admitting this testimony violated his Sixth Amendment right to confront the witnesses against him. The Arizona Court of Appeals affirmed his convictions. On June 21, 2024, the U.S. Supreme Court unanimously reversed, holding that when an expert serves merely as a conduit for the conclusions of a non-testifying analyst, the Confrontation Clause bars such testimony unless the original analyst is available for cross-examination or a valid exception applies. The case was remanded for further proceedings.

The Supreme Court unanimously reversed the Arizona court's decision, ruling that such testimony violated the Confrontation Clause, and remanded the case for further proceedings consistent with its opinion.

Whether the Confrontation Clause allows an expert witness to testify about DNA test results that were performed by a non-testifying analyst without providing the defendant an opportunity to cross-examine the analyst who conducted the testing.

The ruling significantly strengthened criminal defendants' confrontation rights by restricting the use of surrogate expert testimony. It imposed stricter requirements for forensic analysts to testify in person, reshaping trial procedures for DNA and other scientific evidence nationwide and reinforcing the principle that the prosecution cannot bypass cross-examination through substitute witnesses.