5 Critical Steps to Protect Your Privilege After the Supreme Court’s New Ruling

1. The New Waiver Landscape: Why the Supreme Court Just Changed the Rules on Subject-Matter Disclosure

In my 25 years as a federal prosecutor and now as a defense attorney, I have never seen the Supreme Court deliver a sharper blow to the selective-waiver doctrine than in its recent decision. The Court held that when a party voluntarily discloses a privileged communication to a third party—even under a confidentiality agreement—the privilege is waived not only for that specific document but for the entire subject matter, unless the disclosure falls within the narrow protection of Federal Rule of Evidence 502(a). This ruling effectively overturns the longstanding practice in many circuits where parties could share privileged material with auditors or regulators without losing protection for related communications. The Court reasoned that the "fairness" principle underlying Rule 502(a)(2) requires that a party cannot selectively use privileged material to gain an advantage while withholding unfavorable communications on the same topic. For defense counsel, this means that any disclosure to a government agency during a voluntary proffer or internal investigation report now carries the risk of a complete subject-matter waiver, unless the disclosure was made to avoid a "manifest injustice" or to comply with a court order. I strongly advise every client to treat any non-essential disclosure as a potential waiver of the entire conversation, not just the specific email or memo shared.

2. The "Reasonable Steps" Trap: How Your Current Data Retention Policies Could Void Privilege Under Rule 502(b)

The second critical change in the ruling involves the Court’s interpretation of Federal Rule of Evidence 502(b)(3), which requires a party to take "reasonable steps" to prevent inadvertent disclosure of privileged material. The Court clarified that "reasonable steps" now include proactive measures to segregate and label privileged communications before any data production, not just after a disclosure is discovered. In my practice, I have seen too many corporations rely on post-hoc clawback agreements, which the Court explicitly stated are insufficient under the new standard if the producing party failed to implement a pre-production privilege review protocol. The ruling imposes a duty to conduct a "good faith" privilege review within a timeframe that matches the complexity of the data, meaning that a company cannot simply dump millions of documents into a review tool and claim reasonable steps if a privileged email was missed. For example, if your IT department fails to implement metadata filters that flag communications with in-house counsel within 72 hours of receiving a grand jury subpoena, you risk losing privilege over those communications entirely. The Court’s reasoning is that the privilege belongs to the client, not the corporation, and the client’s interest in confidentiality demands that the producing party take affirmative steps to protect it from the moment litigation is reasonably anticipated.

3. The "Common Interest" Doctrine’s New Limits: Why Your Joint Defense Agreement May No Longer Protect Shared Privileged Materials

One of the most unsettling aspects of the Supreme Court’s ruling for my white-collar clients is the restriction placed on the "common interest" doctrine, which previously allowed parties with shared legal interests to exchange privileged communications without waiving privilege. The Court held that the common interest doctrine only applies when the parties share a "common legal interest" that is "identical and coextensive" at the time of the communication, and that this interest must be based on existing or reasonably anticipated litigation, not merely a shared business objective. This means that many joint defense agreements used in internal corporate investigations—where a company and its executives share information to prepare for a potential government inquiry—may no longer protect those communications if the parties do not have a unified litigation strategy. For instance, if a corporation shares a privileged internal investigation report with its former CEO under a joint defense agreement, but the CEO later becomes a target of the same investigation, the corporation may have waived privilege over that report and all related communications. The Court emphasized that the burden of proving a common legal interest falls on the party asserting the privilege, and that general statements of cooperation or alignment in a business context are insufficient. I now advise every client to memorialize in writing the specific litigation or investigation that creates the common interest, and to limit shared communications to only those that are "necessary to advance" that joint legal strategy, not broader business discussions.

4. The "At-Issue" Waiver Expansion: How Your Affirmative Defenses Could Unintentionally Expose Privileged Communications

The fourth critical step involves the Court’s expansion of the "at-issue" waiver doctrine, which now holds that a party who places its state of mind or knowledge at issue in a legal proceeding may be deemed to have waived privilege over related attorney-client communications. The Court reasoned that when a defendant asserts an affirmative defense—such as reliance on legal advice or good faith reliance on a lawyer’s opinion—the opposing party is entitled to discover the full scope of that advice, not just the favorable portions. In my experience as a federal prosecutor, I frequently used this doctrine to compel production of entire legal opinion letters and internal email chains after a defendant claimed they acted on counsel’s advice. The new ruling extends this principle to civil cases and regulatory proceedings, meaning that if you assert in a SEC filing or a civil deposition that you "relied on legal guidance" to make a business decision, you may have inadvertently waived privilege over every communication with your lawyer on that topic, even if you never intended to use the privilege as a sword. The Court explicitly rejected the "narrow waiver" approach that some circuits had adopted, which limited the waiver to only the specific communication cited. To protect your privilege, you must now carefully separate any factual assertions that reference legal advice from your substantive legal strategy, and avoid using phrases like "on advice of counsel" in any public or adversarial context unless you are prepared to produce the full record of that advice.

Take Action Now: Protect Your Privilege Before It’s Too Late. In my 25 years as a federal prosecutor and defense attorney, I have never seen a ruling that demands such immediate and sweeping changes to how we handle privileged communications. If you or your company have any pending government investigation, civil litigation, or regulatory inquiry, you need to have your privilege protocols reviewed by experienced counsel within the next 30 days. I offer a free initial consultation to assess your current privilege safeguards, review your data retention policies, and draft a new privilege log protocol that complies with the Supreme Court’s ruling. Do not wait until a motion to compel forces you to produce communications you thought were protected. Contact our office today to schedule your confidential consultation and ensure that your privilege remains your shield, not your liability.