Fed. R. Evid. 501 — Privilege in General
Plain English
The federal privilege rule keeps privileges flexible. Federal common law—“in the light of reason and experience”—governs privilege claims, unless the Constitution, a federal statute, or a Supreme Court rule provides otherwise. But in civil cases resting on state-law claims, state privilege law controls.
From the Courtroom
Two moving parts. In federal-question cases, privileges are common-law and still evolving—that is how the psychotherapist-patient privilege came to be recognized. In diversity and other state-law civil cases, you apply the forum state’s privilege law, so a Florida-law claim in federal court brings Florida’s privilege statutes (§§ 90.501–90.510). Mixed cases with both federal and state claims get fought hard over which privilege law governs a given document.
Key Points & Authority
- Federal common law governs privilege “in the light of reason and experience,” unless the Constitution, a federal statute, or a Supreme Court rule provides otherwise.
- State-law civil claims. State privilege law applies where state law supplies the rule of decision.
- No closed federal list. Federal privileges can develop over time—contrast Florida’s closed statutory scheme.
Florida Parallel
Florida Parallel: Fed. R. Evid. 501 stands in contrast to § 90.501, Fla. Stat. (Privileges recognized only as provided). Florida takes the opposite approach—a closed statutory list, where privileges exist only as provided by the State Constitution, the Evidence Code, or statute—while FRE 501 leaves federal privileges to evolving common law. Cross-reference is text-only for now; live links added in a later interlinking pass.
About this rule walkthrough
Part of The Evidence Code, hosted by John M. Phillips — Board Certified Civil Trial Lawyer, Court TV analyst, admitted in 8 states + 9 federal districts + SCOTUS.
Free consultation: (904) 444-4444 · About John Phillips
Educational only — not legal advice.
Rule Text (verbatim from the Florida Supreme Court)
The common law — as interpreted by United States courts in the light of reason and experience — governs a claim of privilege unless any of the following provides otherwise:
- the United States Constitution;
- a federal statute; or
- rules prescribed by the Supreme Court.
But in a civil case, state law governs privilege regarding a claim or defense for which state law supplies the rule of decision.
Educational reference. Educational summary of the Federal Rules of Evidence, not legal advice.
What this rule means in plain English
The federal privilege rule keeps privileges flexible. Federal common law—“in the light of reason and experience”—governs privilege claims, unless the Constitution, a federal statute, or a Supreme Court rule provides otherwise. But in civil cases resting on state-law claims, state privilege law controls.