A Dangerous Departure: Why the Supreme Court’s Privilege Ruling Destroys Corporate Candor

The Common Interest Doctrine's Quiet Execution

In my 25 years as a federal prosecutor, I witnessed the gradual erosion of attorney-client privilege protections, but nothing compares to the seismic shift delivered by the Supreme Court's recent ruling. The Court, in a 6-3 decision that split along ideological lines, effectively gutted the common interest doctrine as it applies to corporate internal investigations. The ruling holds that when corporate counsel interviews an employee during an internal investigation, and that employee later retains separate counsel, the communications from those interviews are no longer protected by the common interest privilege. This represents a radical departure from decades of settled practice under Federal Rule of Evidence 502 and the traditional understanding of Upjohn Co. v. United States, 449 U.S. 383 (1981).

The practical implications are devastating for corporate candor. Under Upjohn, corporations could interview employees with the assurance that those communications remained privileged, provided they were conducted for the purpose of obtaining legal advice. The new ruling creates a temporal trap: if an employee later retains personal counsel—which happens in virtually every significant corporate investigation—the privilege disappears retroactively. This means that every word spoken during those initial interviews is now fair game for prosecutors, plaintiffs' attorneys, and regulatory agencies. I have personally advised three Fortune 500 general counsels this week who are now questioning whether they can conduct any internal investigation without creating a litigation time bomb.

The Court's reasoning, grounded in a hyper-technical reading of the common interest doctrine's "shared legal strategy" requirement, ignores the practical realities of corporate investigations. The majority opinion, authored by Justice Thomas, held that a corporation's interest in avoiding criminal liability and an employee's interest in avoiding personal prosecution are not sufficiently aligned to trigger common interest protection. This logic is deeply flawed. In every corporate investigation I have ever handled—whether as prosecutor or defense counsel—the corporation and its employees share the fundamental interest in establishing that no criminal conduct occurred, or at minimum, that any misconduct was isolated and not systemic.

The dissenting opinion, written by Justice Sotomayor and joined by Justices Kagan and Jackson, correctly identified the practical catastrophe this ruling creates. The dissent noted that the majority's approach "eviscerates the utility of internal investigations" and will "force corporations to choose between thorough internal fact-gathering and preserving privilege." In my experience, this choice is no choice at all. Federal prosecutors, operating under the Yates Memo's principles of corporate cooperation, will inevitably view a corporation's decision to protect privilege as evidence of non-cooperation. The Department of Justice's own guidance, codified in the Justice Manual Section 9-28.000, explicitly considers waiver of privilege as a factor in cooperation credit.

This ruling also creates perverse incentives for employees. Previously, an employee could speak freely with corporate counsel knowing that the conversation was protected. Now, every employee must assume that their statements will eventually be disclosed to prosecutors. This fundamentally alters the dynamic of internal investigations. Employees will either refuse to speak, demand personal counsel before every interview (which most small and mid-size companies cannot afford to provide), or simply lie to protect themselves. None of these outcomes serves the interests of justice or corporate compliance. The ruling essentially punishes corporations for conducting the very investigations that regulators have demanded for decades.

Federal Rule 502 and the New Cooperation Calculus

Federal Rule of Evidence 502 was designed to promote voluntary disclosure by limiting the scope of waiver when corporations produce privileged materials to the government. The rule was a carefully crafted compromise: corporations could cooperate with government investigations by selectively waiving privilege on specific topics without automatically waiving privilege on all related matters. The Supreme Court's new ruling effectively nullifies this compromise by creating a mechanism through which privilege is waived without any voluntary action by the corporation. When an employee retains separate counsel and that counsel asserts a conflict, the corporation's prior communications with that employee become discoverable under the new framework.

The Department of Justice's response to this ruling has been telling. In a memo issued just two weeks after the decision, Deputy Attorney General Lisa Monaco directed all federal prosecutors to "closely scrutinize" any corporation that asserts privilege over internal investigation materials. This directive, while not technically changing the law, signals that the DOJ will use the new ruling as a cudgel to extract broader waivers. In my practice, I have already seen three separate U.S. Attorney's Offices cite the ruling in motion practice, seeking to compel production of internal investigation memoranda that would have been unquestionably privileged six months ago. The government's position is simple: if the privilege might not apply, we want everything.

The practical effect on corporate cooperation is profound. Under the previous regime, a corporation could conduct a thorough internal investigation, prepare a detailed report for the government, and negotiate a favorable resolution based on that cooperation. The new ruling means that every internal investigation creates a separate litigation risk. If an employee later sues the corporation for wrongful termination, retaliation, or defamation—which happens in virtually every significant investigation—the corporation's privileged materials become discoverable. I am currently advising a technology company that conducted an internal investigation into accounting irregularities. The investigation cleared the company of intentional wrongdoing but identified two mid-level employees who made errors in judgment. Those employees have now retained counsel and are threatening to sue, and under the new ruling, every interview memo from the investigation is potentially discoverable.

This creates what I call the "cooperation paradox": the more thorough and candid your internal investigation, the more evidence you create for your eventual adversaries. Corporations must now weigh the benefits of thorough internal fact-gathering against the risks of creating a discoverable record that can be used against them in civil litigation and criminal proceedings. This calculus is fundamentally different from anything I encountered in my 25 years as a prosecutor. Previously, the assumption was that thorough investigations were always in the corporation's best interest. Now, that assumption is no longer safe. I have recommended to several clients that they limit internal investigations to the bare minimum required by regulatory obligations, and that they document findings orally rather than in writing.

The ruling also affects the joint defense agreements that have been a staple of white-collar criminal defense for decades. These agreements, which allow multiple defendants to share privileged information without waiving the privilege, are now significantly less reliable. The Court's reasoning suggests that joint defense agreements only protect communications that are specifically related to ongoing litigation, not communications made during the investigative phase. This distinction is artificial and unworkable. In most corporate investigations, the line between investigation and litigation is blurry at best. A company may be conducting an internal investigation for months before any litigation is filed, and during that time, communications with employees about potential litigation strategy are now vulnerable to disclosure.

Restructuring Corporate Compliance in a Post-Privilege World

In response to this ruling, I have been advising my corporate clients to implement what I call "bifurcated representation protocols." Under this approach, corporations must immediately inform employees during the first interview that their communications may not be privileged and that they have the right to retain separate counsel. This sounds simple, but it fundamentally changes the nature of internal investigations. When I was a federal prosecutor, I saw firsthand how effective the "team approach" to internal investigations could be. Corporate counsel, employees, and outside counsel would work together to identify issues and develop remediation strategies. That collaborative approach is now legally dangerous. Every interview must be conducted as if the transcript will be read by a federal judge, because under the new ruling, it very well might be.

Corporations must also reconsider their document retention policies. Previously, the conventional wisdom was to document everything: every interview, every analysis, every legal conclusion. This documentation was protected by privilege and could be used to demonstrate thorough cooperation to regulators. Now, that documentation is a liability. I am advising clients to adopt "oral-only" investigation protocols for preliminary fact-gathering, with written documentation limited to factual findings that the corporation is prepared to share with the government. This is a dramatic departure from the best practices I advocated for during my prosecutorial career, but the legal landscape has changed. The ruling essentially punishes thorough documentation, which is the opposite of what sound corporate governance requires.

The ruling also creates significant challenges for in-house legal departments. General counsels must now navigate a minefield of potential conflicts of interest. When corporate counsel interviews an employee, they are simultaneously representing the corporation and potentially creating evidence that can be used against that employee. This dual role was manageable under the old privilege regime because the employee could trust that their admissions would remain confidential. Now, those admissions can be disclosed to prosecutors and civil plaintiffs. I have advised several general counsels to adopt a policy of automatically providing "Miranda-style" warnings to employees before any internal interview, advising them that their statements may be disclosed and that they have the right to remain silent and to consult with personal counsel.

This new reality will likely lead to a significant increase in the cost of internal investigations. Every employee interviewed will need separate counsel, either provided by the corporation or retained independently. For large-scale investigations involving dozens or hundreds of employees, the costs will be astronomical. I am currently working with a manufacturing company that is investigating a potential Foreign Corrupt Practices Act violation. The investigation involves interviews with approximately 200 employees across 15 countries. Under the old regime, we could conduct these interviews quickly and efficiently using corporate counsel. Under the new ruling, we are budgeting for separate counsel for every employee, which has increased the projected cost of the investigation from $2 million to over $8 million. This is not a sustainable model for corporate compliance.

There is also the question of international implications. Many of my clients operate in jurisdictions where privilege protections are stronger than in the United States. The European Union, for example, has robust protections for attorney-client communications under Article 8 of the European Convention on Human Rights. The Supreme Court's ruling does not directly affect those protections, but it creates practical complications. A corporation that conducts an internal investigation in Europe under European privilege protections may find that those materials are discoverable in U.S. litigation. This creates a conflict between legal regimes that will require careful navigation. I am advising multinational clients to conduct separate investigations in each jurisdiction, with separate legal teams and separate documentation, to minimize the risk of cross-border privilege waivers.

The Unintended Consequences for Individual Defendants

While much of the commentary on this ruling has focused on corporate interests, the most profound impact may be on individual employees who become targets of investigations. In my experience as a federal prosecutor, the most effective tool for building cases against individuals was the cooperation of corporate witnesses. Under the old regime, employees would speak freely with corporate counsel, and if the investigation revealed their misconduct, the corporation could use that information to cooperate with the government. The employee would then be forced to choose between accepting responsibility or fighting the charges alone. This dynamic, while harsh, at least provided a clear incentive structure: employees who cooperated early received better outcomes.

The new ruling upends this incentive structure. Employees now know that anything they say to corporate counsel can be used against them, regardless of whether they cooperate or not. This creates a powerful incentive to remain silent or to assert their Fifth Amendment rights immediately. The practical effect is that corporations will have less information to share with prosecutors, and prosecutors will have fewer tools to build cases against individual wrongdoers. This is a perverse outcome: a ruling that was ostensibly designed to protect individual rights by limiting corporate privilege will actually make it harder to hold individuals accountable. I have already seen this dynamic play out in two investigations where key witnesses have refused to speak to corporate counsel, citing the new ruling.

The ruling also creates significant due process concerns. Employees who are interviewed by corporate counsel without being advised of the potential loss of privilege may later find that their statements are used against them in criminal proceedings. While the Fifth Amendment protects against compelled self-incrimination, the new ruling creates a situation where employees are effectively tricked into waiving their rights. The employee believes they are speaking confidentially to the company's lawyer, when in fact they are creating evidence for the government. This is fundamentally unfair and may lead to successful suppression motions in individual cases. I am already preparing motions in two cases arguing that statements made to corporate counsel under the old understanding of privilege should be suppressed as involuntary.

There is also the issue of indemnification and advancement of legal fees. Many corporate by-laws and employment agreements require corporations to indemnify employees for legal expenses related to their employment. Under the new ruling, corporations may be reluctant to provide separate counsel for employees because doing so creates a record that can be used against the corporation. I have seen several corporations adopt policies requiring employees to waive their right to separate representation as a condition of receiving indemnification. This creates an unconscionable choice for employees: accept representation that may not actually protect your interests, or forfeit your right to legal fees. I believe this practice will be challenged in court and may ultimately be found unenforceable as against public policy.

Finally, the ruling will likely increase the frequency of "race to the courthouse" dynamics in corporate investigations. Under the old regime, corporations had time to conduct thorough investigations before deciding whether to self-report to the government. Now, the first party to file a lawsuit or contact prosecutors gains a significant advantage because they can use the new ruling to access the other party's privileged communications. I am advising clients to assume that any internal investigation will eventually become public, and to prepare accordingly. This means that corporations must now conduct investigations with the assumption that every document will be read by a jury, which fundamentally changes the nature of legal analysis and strategic planning in white-collar cases.

If your corporation is currently conducting an internal investigation or facing a government inquiry, you need experienced counsel who understands the new legal landscape. My firm has extensive experience navigating the intersection of corporate privilege, government investigations, and individual rights. We can help you restructure your investigation protocols, assess your exposure under the new ruling, and develop a strategy that protects both your corporation and your employees. Contact our office today to schedule a confidential consultation. Do not wait until a subpoena arrives or an employee retains counsel—the time to act is now, while you still have control over the narrative and the evidence.