28 C.F.R. § 115.51 : Judicial Administration — DEPARTMENT OF JUSTICE — PRISON RAPE ELIMINATION ACT NATIONAL STANDARDS — STANDARDS FOR ADULT PRISONS AND JAILS —REPORTING — Inmate reporting

(a) The agency shall provide multiple internal ways for inmates to privately report sexual abuse and sexual harassment, retaliation by other inmates or staff for reporting sexual abuse and sexual harassment, and staff neglect or violation of responsibilities that may have contributed to such incidents.
(b) The agency shall also provide at least one way for inmates to report abuse or harassment to a public or private entity or office that is not part of the agency, and that is able to receive and immediately forward inmate reports of sexual abuse and sexual harassment to agency officials, allowing the inmate to remain anonymous upon request. Inmates detained solely for civil immigration purposes shall be provided information on how to contact relevant consular officials and relevant officials at the Department of Homeland Security.
(c) Staff shall accept reports made verbally, in writing, anonymously, and from third parties and shall promptly document any verbal reports.
(d) The agency shall provide a method for staff to privately report sexual abuse and sexual harassment of inmates.

28 C.F.R. § 115.51