Frye v. United States was a Supreme Court case that focused on the admissibility of expert testimony based on a novel scientific technique. The case centered around a defendant, Frye, who was charged with second-degree murder and argued that the results of a systolic blood pressure test should be admitted as evidence in his trial. The Supreme Court ultimately ruled that the results of the test were inadmissible, as the technique had not yet gained general acceptance in the scientific community.