28 C.F.R. § 540.10 Purpose and scope.
Title 28 - Judicial Administration
The Bureau of Prisons encourages correspondence that is directed to socially useful goals. The Warden shall establish correspondence procedures for inmates in each institution, as authorized and suggested in this rule.
Title 28: Judicial Administration
PART 540—CONTACT WITH PERSONS IN THE COMMUNITY
Subpart B—Correspondence
§ 540.10 Purpose and scope.