Conditions of confinement for all persons in BOP custody are set in accordance with various BOP policies. Any additional restrictions imposed pursuant to 28 C.F.R. § 501.3 will not affect the implementation of BOP policies unless specifically set forth in the memorandum from the Attorney General directing the implementation of special administrative measures. The Bureau of Prisons will continue to have authority to take any other measures with respect to an inmate subject to special administrative measures deemed necessary to maintain the order, safety, security, and discipline of any BOP institution.