Searching a lawyer's office and the seizure of privileged documents located in their office are possible only if these measures are likely to prove that the lawyer committed a criminal offense or was an accomplice in such offense. The search must be (i) authorized by the Judge of Freedoms and Detention (Juge des libertés et de la détention), and (ii) conducted by an investigating judge or public prosecutor, in the presence of the president of the bar association (Bâtonnier) who will ensure the protection of legal privilege.

In its rulings of 11 March 2025, the French Supreme Court clarified that, when a lawyer is suspected of having participated in an offense, it is possible to seize documents from their office or home, even if those documents relate to the rights of the defense and would normally be protected by professional secrecy. However, the existence of plausible grounds for suspecting the lawyer must be clearly stated in the search warrant. If this information is not mentioned, the President of the Bar is deprived of the necessary elements to fulfil their mission of protecting defense rights during the search.

The Court confirmed that, when the lawyer is not under suspicion, no document relating to the exercise of defense rights and covered by professional secrecy may be seized.

The Court also addressed the issue of whether documents protected by professional secrecy but not connected to defense rights — such as legal advice — can be seized. It ruled that such documents are indeed seizable, and it rejected the argument that European human rights provisions provide broader protection in this context. The Court reaffirmed that only documents directly linked to the defense of a client in a legal procedure are protected. This decision is in line with an earlier decision rendered by the French Supreme Court on 24 September 2024 in which the Court used the distinction between documents directly linked to the defense of a client in a legal procedure and legal advice to exclude the latter from the scope of protection of professional secrecy.

Therefore, the Court, drew a clear line between defense-related documents, which cannot be seized under any circumstances, and other documents covered by professional secrecy.

The restriction on the scope of secrecy is a matter of debate and does not align with EU law. Indeed, in a recent decision dated 26 September 2024 (No. C-432/23), the Court of Justice of the European Union considered that legal advice given by a lawyer falls within the scope of the enhanced protection afforded by EU law to exchanges between lawyers and their clients and therefore is protected by professional secrecy.

In another ruling, the Court dealt with whether judges supervising the search could assess the proportionality of the search. It concluded that this evaluation does not fall within the scope of the judge or the Bar President overseeing the search. Instead, such control is exercised later by the investigative chamber if a motion is filed to annul procedural acts. This remains true even when the seizure of documents is being challenged.

Searches and seizures of privileged documents may, in strictly limited circumstances and upon authorization by a judge, also be performed by tax and customs authorities if there are strong reasons to believe that a taxpayer is committing tax fraud. The same applies to antitrust authorities.

Disclosure of privileged documents or information remains exceptional, and any seizure of privileged documents and information must be limited to the documents strictly necessary to establish the truth.

Documents prepared specifically for the defense of the prosecuted person cannot be seized.

Documents protected by legal advice privilege, such as legal opinions, correspondence or exhibits that were not prepared in the context of a specific litigation proceedings cannot be seized, except in the following cases: tax fraud, corruption, influence peddling, terrorism financing and money laundering investigations. In those cases, authorities must prove that the legal opinions, correspondence or exhibits that are in possession of, or were communicated by, the lawyer or the client were used for committing or facilitating the commission of said offenses.