28 C.F.R. § 543.13 : Judicial Administration — BUREAU OF PRISONS, DEPARTMENT OF JUSTICE — INSTITUTIONAL MANAGEMENT — LEGAL MATTERS — INMATE LEGAL ACTIVITIES — Visits by attorneys

(a) The Warden shall, under the conditions of this section, permit visits by the retained, appointed, or prospective attorney of an inmate or by an attorney who wishes to interview an inmate as a witness.
(b) The Warden generally may not limit the frequency of attorney visits since the number of visits necessary is dependent upon the nature and urgency of the legal problems involved. The Warden shall set the time and place for visits, which ordinarily take place during regular visiting hours. Attorney visits shall take place in a private conference room, if available, or in a regular visiting room in an area and at a time designed to allow a degree of privacy. The Warden may make exceptions according to local conditions or for an emergency situation demonstrated by the inmate or visiting attorney.
(c) The attorney shall make an advance appointment for the visit through the Warden prior to each visit; however, the Warden shall make every effort to arrange for a visit when prior notification is not practical.
(d) The Warden may require an attorney to indicate where he is licensed as an attorney and how that fact may be verified. Prior to each appointment or visit, the Warden shall require each attorney to identify himself and to confirm that he wishes to visit an inmate who has requested his visit or whom he represents or whom he wishes to interview as a witness. The Warden may not ask the attorney to state the subject matter of the law suit or interview. If there is any question about the identity of the visitor or his qualification as an attorney in good standing, the Warden shall refer the matter to the Regional Counsel.
(e) Staff may not subject visits between an attorney and an inmate to auditory supervision. The Warden may permit tape recordings to be used by an attorney during the course of a visit only if the attorney states in writing in advance of the interview that the sole purpose of the recording is to facilitate the attorney-client or attorney-witness relationship.
(f) The Warden may, at any time, subject an attorney to a search of his person and belongings for the purpose of ascertaining if contraband is present, as a condition of visiting an inmate.

28 C.F.R. § 543.13