; and (C) develop a suitable tool to assess the recidivism risk level of prisoners in prerelease custody. (3) Use of existing risk and needs assessment tools permitted In carrying out this subsection, the Attorney General may use existing risk and needs assessment tools, as appropriate, for the assessment tools required under paragraph (2). (4) Use of presentence report In carrying out this subsection, the Attorney General shall coordinate with the United States Probation and Pretrial Services to ensure that the findings of the Presentence Report of each offender are available and considered in the Assessment System. (5) Validation In carrying out this subsection, the Attorney General shall statistically validate the risk and needs assessment tools on the Federal prison population, or ensure that the tools have been so validated. To the extent such validation cannot be completed with the time period specified in subsection (a), the Attorney General shall ensure that such validation is completed as soon as is practicable. (6) Relationship with existing classification systems The Bureau of Prisons may incorporate its existing Inmate Classification System into the Assessment System if the Assessment System assesses the risk level and criminogenic needs of each prisoner and determines the appropriate security level institution for each prisoner. Before the development of the Assessment System, the Bureau of Prisons may use the existing Inmate Classification System, or a pre-existing risk and needs assessment tool that can be used to classify prisoners consistent with subsection (a)(1), or can be reasonably adapted for such purpose, for purposes of this section, section 3621(h), and section 3624(c). (c) Risk assessment (1) Initial assessments Not later than 30 months after the date on which the Attorney General develops the Assessment System, the Bureau of Prisons shall determine the risk level and criminogenic needs of each prisoner using the Assessment System. (2) Reassessments and updates The Bureau of Prisons