; and (4) determine when a prisoner is ready to transfer into prerelease custody in accordance with section 3624(g) of title 18, United States Code, as added by this title. (b) Risk and needs assessment tools (1) In general The Attorney General shall— (A) adapt the Federal Post Conviction Risk Assessment Tool developed and utilized by the Administrative Office of the United States Courts in order to develop suitable risk and needs assessment tools to be used in the System developed under subsection (a) by using the research and data analysis required to be conducted under section 101(b)(3) on the best available risk and needs assessment tools available as of the date of the enactment of this Act, and determining, using the methods required under section 101(c), how to make the most effective and efficient tools to accomplish for each prisoner, the assessments, assignments, and reassessments described in paragraphs (1) through (3) of subsection (a); and (B) ensure that the risk and needs assessment tool to be used in the reassessments described in subsection (a)(3) measures and uses dynamic risk factors, indicators of progress, and of regression, including newly acquired skills and changes in attitude and behavior over time. (2) Validation on prisoners In carrying out this subsection, the Attorney General shall statistically validate any tools that the Attorney General selects for use in the System on the Federal prison population, or ensure that the tools have been so validated. (3) Evaluation The Attorney General shall ensure that the System does not result in unwarranted disparities, including by— (A) annually evaluating rates of recidivism among similarly classified prisoners to identify any unwarranted disparities in such rates, including disparities among similarly classified prisoners of different demographic groups