Cal. Welf. & Inst. Code § 1731.7

(a) The Department of Corrections and Rehabilitation, Division of Juvenile Justice, shall establish and operate a seven-year pilot program for transition-aged youth. Commencing on or after January 1, 2019, the program shall divert a limited number of transition-aged youth from adult prison to a juvenile facility in order to provide developmentally appropriate, rehabilitative programming designed for transition-aged youth with the goal of improving their outcomes and reducing recidivism.
(b) The department may develop criteria for placement in this program, initially targeting youth sentenced by a superior court who committed an offense described in subdivision (b) of Section 707 prior to 18 years of age. Youth with a period of incarceration that cannot be completed on or before their 25th birthday are ineligible for placement in the transition-aged youth program. The department may consider the availability of program credit earning opportunities that lower the total length of time a youth serves in determining eligibility.
(c) Notwithstanding any other law, following sentencing, an individual who is 18 years of age or older at the time of sentencing and who has been convicted of an offense described in subdivision (b) of Section 707 that occurred prior to 18 years of age shall remain in local detention pending a determination of acceptance or rejection by the Division of Juvenile Justice. The Division of Juvenile Justice shall notify the local detention authority upon determination of acceptance or rejection of an individual pursuant to this subdivision.
(d) An eligible person may be transferred to the Division of Juvenile Justice by the Secretary of the Department of Corrections and Rehabilitation with the approval of the Director of the Division of Juvenile Justice. Notwithstanding subdivision (b) of Section 2900 of the Penal Code, the secretary, with the concurrence of the director, may designate a facility under the jurisdiction of the Division of Juvenile Justice as a place of reception for a person described in this section.
(e) The duration of the transfer shall extend until either of the following occurs:
1. (1) The director orders the youth returned to the Department of Corrections and Rehabilitation.
2. (2) The youth’s period of incarceration is completed.
(f) The Division of Juvenile Justice shall produce and submit a report to the Legislature on January 1, 2020, to assess the program. At a minimum, the report shall include all of the following:
1. (1) Criteria used to determine placement in the program.
2. (2) Guidelines for satisfactory completion of the program.
3. (3) Demographic data of eligible and selected participants, including, but not limited to, county of conviction, race, gender, sexual orientation, and gender identity and expression.
4. (4) Disciplinary infractions incurred by participants.
5. (5) Good conduct, milestone completion, rehabilitative achievement, and educational merit credits earned in custody.
6. (6) Quantitative and qualitative measures of progress in programming.
7. (7) Rates of attrition of program participants.
(g) The Division of Juvenile Justice shall contract with one or more independent universities or outside research organizations to evaluate the effects of participation in the program established by this section. This evaluation shall include, at a minimum, an evaluation of cost-effectiveness, recidivism data, consistency with evidence-based principles, and program fidelity. If sufficient data is available, the evaluation may also compare participant outcomes with a like group of similarly situated transition aged youth retained in the counties or incarcerated in adult institutions.
(h) The Division of Juvenile Justice shall promulgate regulations to implement this section.
(i) Effective July 1, 2020, the pilot program operated pursuant to this section shall be suspended. Any pilot program participants who were diverted from an adult prison pursuant to this section and who were housed at the Division of Juvenile Justice prior to January 1, 2020, may remain at the Division of Juvenile Justice pursuant to subdivision (e).