Not later than 90 days after April 9, 2008, the Director of the Bureau of Prisons shall, in order to promote stability and continued assistance to offenders after release from prison, adopt and implement a policy to ensure that any person who provides mentoring services to an incarcerated offender is permitted to continue such services after that offender is released from prison. That policy shall permit the continuation of mentoring services unless the Director demonstrates that such services would be a significant security risk to the released offender, incarcerated offenders, persons who provide such services, or any other person.