705 ILCS 405/3-3
Those requiring authoritative intervention include any minor under 18 years of age (1) who is (a) absent from home without consent of parent, guardian or custodian, or (b) beyond the control of the minor's parent, guardian or custodian, in circumstances which constitute a substantial or immediate danger to the minor's physical safety; and (2) who, after being taken into limited custody for the period provided for in this Section and offered interim crisis intervention services, where available, refuses to return home after the minor and the minor's parent, guardian or custodian cannot agree to an arrangement for an alternative voluntary residential placement or to the continuation of such placement. Any minor taken into limited custody for the reasons specified in this Section may not be adjudicated a minor requiring authoritative intervention until the following number of days have elapsed from the minor having been taken into limited custody: 21 days for the first instance of being taken into limited custody and 5 days for the second, third, or fourth instances of being taken into limited custody. For the fifth or any subsequent instance of being taken into limited custody for the reasons specified in this Section, the minor may be adjudicated as requiring authoritative intervention without any specified period of time expiring after the minor being taken into limited custody, without the minor's being offered interim crisis intervention services, and without the minor's being afforded an opportunity to agree to an arrangement for an alternative voluntary residential placement. Notwithstanding any other provision of this Section, for the first instance in which a minor is taken into limited custody where one year has elapsed from the last instance of the minor's having been taken into limited custody, the minor may not be adjudicated a minor requiring authoritative intervention until 21 days have passed since being taken into limited custody.
705 ILCS 405/3-3