Privileges: General Principles and Policies

Evidentiary privileges are among the most critical and counterintuitive rules in the law of evidence. They allow parties to withhold relevant, probative information from the fact-finder, not because the information is unreliable, but because society values the confidentiality of certain relationships more highly than the search for truth in a particular case. Understanding the "why" behind privileges is essential to applying their complex "how."

The Core Tension: Truth-Seeking vs. Relationship Protection

At the heart of evidence law lies a fundamental commitment to truth-seeking. Rules are designed to bring all reliable, relevant information before the court so that disputes can be resolved accurately. Evidentiary privileges create a deliberate exception to this principle. A privilege is a legal rule that permits a witness to refuse to testify or to prevent another from testifying about a confidential communication.

The justification is that certain confidential relationships—such as those between attorney and client, husband and wife, or priest and penitent—are so vital to a functioning society that they must be fostered and protected. The law sacrifices the truth in the immediate case to encourage open communication within these relationships, which is believed to yield greater societal benefits in the long run. This creates a perpetual tension: every time a privilege is successfully asserted, the court is knowingly proceeding with less than the full picture of the facts.

The Wigmore Four-Part Test for Recognizing New Privileges

While specific privileges like attorney-client are well-established, courts are sometimes asked to recognize new ones. The dominant framework for this analysis is the Wigmore four-part test, named after evidence scholar John Henry Wigmore. For a communication to be privileged, it must satisfy all four criteria:

1. The communications must originate in a confidence that they will not be disclosed. The essential element is the subjective expectation of privacy at the time of the communication.
2. This confidentiality must be essential to the full and satisfactory maintenance of the relation between the parties. The relationship itself must be one that society wishes to promote, and confidentiality must be a cornerstone of it.
3. The relation must be one which, in the opinion of the community, ought to be sedulously fostered. This is a policy question: is the relationship so important that it outweighs the normal need for all evidence?
4. The injury that would inure to the relation by the disclosure of the communications must be greater than the benefit thereby gained for the correct disposal of litigation. This is a balancing test, weighing the harm to the relationship against the cost to justice in the specific case.

A proposed privilege (e.g., for journalists, accountants, or therapists) often fails at the third or fourth step, as courts are generally reluctant to expand privileges beyond a narrow set of historically recognized relationships.

Waiver: How a Privilege Can Be Lost

A privilege is not an immutable right; it can be lost through waiver. The holder of the privilege (e.g., the client, not the attorney) controls it and can voluntarily relinquish it. Waiver can be express or implied. Crucially, waiver can occur through offensive use or by failing to safeguard confidentiality.

• Voluntary Disclosure: The most common form of waiver is the voluntary disclosure of a significant part of the privileged communication to a third party outside the protected relationship. For example, if a client forwards a confidential email from their attorney to a business colleague, the privilege as to that communication is likely waived.
• Offensive Use: A party cannot use the privilege as both a sword and a shield. If a party affirmatively relies on the content of a privileged communication to support a claim or defense (e.g., "I acted because my lawyer advised me to"), they waive the privilege as to all communications on that subject matter. This is sometimes called "at-issue" waiver.
• Failure to Object: During discovery or at trial, a privilege holder must promptly and specifically object to the disclosure of privileged information. Sitting idly by while privileged information is disclosed can result in a finding of waiver.

The Crime-Fraud Exception

No privilege is absolute. A critical common limitation is the crime-fraud exception. This doctrine states that a privilege does not protect communications made for the purpose of facilitating or furthering a future crime or fraud.

• Rationale: The societal interest in protecting confidential communication does not extend to conversations that are themselves part of wrongful conduct. The law will not shield a client who asks a lawyer for help in drafting a fraudulent contract or a person who seeks a doctor's note to support a false insurance claim.
• Procedure: To invoke the exception, the party seeking disclosure must make a prima facie showing that the client was engaged in or planning a crime or fraud and that the communications in question were in furtherance of that scheme. If this threshold showing is made, the judge will typically conduct an in camera (private) review of the communications to determine if the exception applies. If it does, the privilege is pierced, and the communications are admissible.

The Federal Common Law Approach Under FRE 501

In federal courts, privileges are not governed by a detailed code but by Federal Rule of Evidence 501. This rule provides that privilege "is governed by the common law—except that in civil cases, state law governs privilege regarding a claim or defense for which state law supplies the rule of decision." This creates a two-track system:

1. Federal Common Law in Criminal Cases & Federal Question Civil Cases: In these proceedings, federal judges develop privilege law based on "reason and experience," guided by precedent and the principles discussed above (like the Wigmore test). This gives federal courts flexibility but can lead to variations between circuits.
2. State Law in Diversity Civil Cases: In civil cases based on state law claims brought in federal court (diversity jurisdiction), the federal court must apply the privilege law of the state that supplies the substantive rule of decision. This is a major exception to the general principle that federal procedural rules apply in federal court, underscoring the substantive nature of privilege rules.

This framework means practitioners must always perform a choice-of-law analysis at the outset of a federal case to determine which jurisdiction's privilege law applies.

Common Pitfalls

1. Assuming Privilege is Automatic: Merely communicating with an attorney, spouse, or doctor does not automatically render the conversation privileged. The communication must be made in confidence for the purpose of seeking or providing professional services within that relationship. A business discussion with a lawyer, or a casual remark to a spouse in front of friends, may not be protected.
2. Confusing Privilege with Work Product: The attorney-client privilege protects confidential communications. The broader work product doctrine (governed by FRCP 26(b)(3)) protects an attorney's mental impressions, theories, and strategies prepared in anticipation of litigation. Work product has different (and often stronger) protections and waiver rules. Conflating the two can lead to improper disclosure or failed assertions of protection.
3. Inadvertent Waiver Through Carelessness: Failing to label confidential documents, including third parties in emails, or discussing privileged matters in public areas can destroy confidentiality and waive the privilege. Protecting a privilege requires proactive and consistent behavior.
4. Misapplying the Crime-Fraud Exception: The exception requires that the communication be in furtherance of a future crime or fraud. It does not apply to communications about a past wrongdoing (which remain privileged) or to communications that merely disclose a crime without seeking to advance it. Misunderstanding this scope can lead to overbroad discovery demands or unjustified refusals to disclose.

Summary

• Privileges are societal choices to exclude relevant evidence in order to encourage candid communication within relationships deemed more valuable than the truth in a single lawsuit.
• The Wigmore four-part test provides the analytical framework for courts to decide whether to recognize a new privilege, balancing the necessity of confidentiality against the needs of the judicial system.
• Privileges are controlled by their holder and can be waived through voluntary disclosure, offensive use, or a failure to object promptly.
• The crime-fraud exception is a universal limit, stripping protection from communications made to further ongoing or future criminal or fraudulent activity.
• In federal court, FRE 501 creates a dual system: federal common law governs most cases, but state privilege law applies in diversity cases involving state law claims, requiring careful jurisdictional analysis.