California Code, Penal Code - PEN § 1203f

Every probation department shall ensure that all probationers under active supervision who are deemed to pose a high risk to the public of committing sex crimes, as determined by the State-Authorized Risk Assessment Tool for Sex Offenders, as set forth in Sections 290.04 to 290.06, inclusive, are placed on intensive and specialized probation supervision and are required to report frequently to designated probation officers.  The probation department may place any other probationer convicted of an offense that requires him or her to register as a sex offender who is on active supervision to be placed on intensive and specialized supervision and require him or her to report frequently to designated probation officers.