After the conclusion of each calendar year following the enactment of this section, the Director of Finance, in consultation with the Department of Corrections and Rehabilitation, the Joint Legislative Budget Committee, the Chief Probation Officers of California, and the Administrative Office of the Courts, shall calculate the following for that calendar year:
(a) The cost to the state to incarcerate in prison and supervise on parole a probationer sent to prison. This calculation shall take into consideration factors, including, but not limited to, the average length of stay in prison and on parole for probationers, as well as the associated parole revocation rates, and revocation costs.
(b) The statewide probation to prison rate. The statewide probation failure to prison rate shall be calculated as the total number of adult felony probationers statewide sent to prison in the previous year as a percentage of the average statewide adult felony probation population for that year.
(c) A probation failure to prison rate for each county. Each county’s probation failure to prison rate shall be calculated as the number of adult felony probationers sent to prison from that county in the previous year as a percentage of the county’s average adult felony probation population for that year.
(d) An estimate of the number of adult felony probationers each county successfully prevented from being sent to prison. For each county, this estimate shall be calculated based on the reduction in the county’s probation failure to prison rate as calculated annually pursuant to subdivision (c) of this section and the county’s baseline probation failure rate as calculated pursuant to Section 1233. In making this estimate, the Director of Finance, in consultation with the Department of Corrections and Rehabilitation, the Joint Legislative Budget Committee, the Chief Probation Officers of California, and the Administrative Office of the Courts, shall adjust the calculations to account for changes in each county’s adult felony probation caseload in the most recent completed calendar year as compared to the county’s adult felony probation population during the period 2006 to 2008, inclusive.
(e) In calculating probation failure to prison rates for the state and individual counties, the number of adult felony probationers sent to prison shall include those adult felony probationers sent to state prison for a revocation of probation, as well as adult felony probationers sent to state prison for a conviction of a new felony offense. The calculation shall also include adult felony probationers who are sent to prison for conviction of a new crime and who simultaneously have their probation terms terminated.