It’s complicated. The first question is: Is the lawyer a suspect, subject, or target of the search? The Department of Justice guidelines treat searches of “subject” attorneys different than those of “disinterested” third-party attorneys.
If the attorney is a subject of the search, Section 9-13.410 of the U.S Attorneys’ Manual applies. See, here: 9-13.000 - Obtaining Evidence | JM | Department of Justice
In such cases, the procedures generally call for a “privilege team” (seemingly also referred to as a “taint team” by the press) of lawyers who are not otherwise involved in the underlying investigation to help protect attorney-client privilege. The privilege team must have “procedures designed to minimize the intrusion into privileged material, and should ensure that the privilege team does not disclose any information to the investigation/prosecution team unless and until so instructed by the attorney in charge of the privilege team.”
Under the US Attorneys’ Manual, the affidavit filed with the court to obtain the search warrant being executed “may attach any written instructions or, at a minimum, should generally state the government’s intention to employ procedures designed to ensure that attorney-client privileges are not violated.” This affidavit can be viewed as a promise to the court that the people executing the search warrant will protect privilege in the way described in the affidavit. By swearing that the affidavit (and their promises) are true, it imposes real limits on the scope of the search and how the materials seized can be reviewed.
The procedures described in the warrant affidavit are supposed to consider things like:
[ul]
[li]Who will conduct the review, i.e., a privilege team, a judicial officer, or a special master.[/li][li]Whether all documents will be submitted to a judicial officer or special master or only those which a privilege team has determined to be arguably privileged or arguably subject to an exception to the privilege.[/li][li]Whether copies of all seized materials will be provided to the subject attorney (or a legal representative) in order that: a) disruption of the law firm’s operation is minimized; and b) the subject is afforded an opportunity to participate in the process of submitting disputed documents to the court by raising specific claims of privilege. To the extent possible, providing copies of seized records is encouraged, where such disclosure will not impede or obstruct the investigation.[/li][li]Whether appropriate arrangements have been made for storage and handling of electronic evidence and procedures developed for searching computer data (i.e., procedures which recognize the universal nature of computer seizure and are designed to avoid review of materials implicating the privilege of innocent clients).[/li][/ul]
So, the privilege team may review the documents itself. Alternatively, the documents may be reviewed by a judicial officer or a special master (essentially, a court-appointed independent person), who will then give only those documents that are not privileged back to the Department of Justice. I understand that the most common case is for the privilege team to review the documents itself.
Embedded in these procedures is the idea that only documents that are not privileged may be admitted into evidence against the subject attorney or his client. Furthermore, documents outside the scope of the warrant (i.e., documents that pertain to “innocent clients”) can’t be used against them.
One of the important exceptions to attorney-client privilege in such cases is the “crime-fraud exception.” Communications between an attorney and a client that are designed to either commit a crime or to cover one up are not privileged.