(a) If the agency has responsibility for investigating allegations of sexual abuse, all investigations into alleged sexual abuse must be prompt, thorough, objective, and conducted by specially trained, qualified investigators.

(b) Upon conclusion of a criminal investigation where the allegation was substantiated, an administrative investigation shall be conducted. Upon conclusion of a criminal investigation where the allegation was unsubstantiated, the agency shall review any available completed criminal investigation reports to determine whether an administrative investigation is necessary or appropriate. Administrative investigations shall be conducted after consultation with the appropriate investigative office within DHS and the assigned criminal investigative entity.

(c) The agency shall develop written procedures for administrative investigations, including provisions requiring:

(1) Preservation of direct and circumstantial evidence, including any available physical and DNA evidence and any available electronic monitoring data;

(2) Interviewing alleged victims, suspected perpetrators, and witnesses;

(3) Reviewing prior complaints and reports of sexual abuse involving the suspected perpetrator;

(4) Assessment of the credibility of an alleged victim, suspect, or witness, without regard to the individual's status as detainee, staff, or employee, and without requiring any detainee who alleges sexual abuse to submit to a polygraph;

(5) Documentation of each investigation by written report, which shall include a description of the physical and testimonial evidence, the reasoning behind credibility assessments, and investigative facts and findings; and

(6) Retention of such reports for as long as the alleged abuser is detained or employed by the agency, plus five years. Such procedures shall establish the coordination and sequencing of the two types of investigations, in accordance with paragraph (b) of this section, to ensure that the criminal investigation is not compromised by an internal administrative investigation.

(d) The departure of the alleged abuser or victim from the employment or control of the agency shall not provide a basis for terminating an investigation.

(e) When outside agencies investigate sexual abuse, the agency shall cooperate with outside investigators and shall endeavor to remain informed about the progress of the investigation.