How does attorney-client privilege limit discovery in a lawsuit?

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Mosaic portrait of Emperor Justinian I with a jeweled crown and halo, from the 6th-century Basilica of San Vitale in Ravenna, Italy. — Procedural law Justinian I, detail of a 6th-century mosaic at the Church of San Vitale, Ravenna, Italy.

In the context of procedural law, attorney-client privilege serves as a critical protection that limits the scope of discovery during a lawsuit. Because this privilege recognizes a special duty of fidelity and secrecy between an attorney and their client, these communications are considered protected and generally do not have to be disclosed to the court.1

By shielding these private exchanges from mandatory disclosure, the privilege ensures that clients can communicate openly and honestly with their legal counsel without fear that their statements will be used against them in litigation. This protection is fundamental to maintaining the integrity of the legal process, as it fosters the trust necessary for effective legal representation. Consequently, during the discovery phase, parties are typically exempt from producing documents or answering questions that would reveal the substance of these confidential, privileged communications.1