The plaintiffs successfully argued that after Congress adopted the Federal Rules of Evidence in 1975, "Frye" was no longer the governing standard for admitting scientific evidence in trials held in federal court. The Supreme Court agreed and had already ruled that where common law rules conflicted with provisions of the Rules, the enactment of the Rules had the effect of supplanting the common law. "Frye" was certainly part of the federal common law of evidence because it was decided almost 50 years before the Rules were enacted. But the text of the Rules did not suggest that Congress intended to keep the "Frye" rule, and so the Court reasoned that "Frye" was no longer the rule.