Indiana Code Title 31. Family Law and Juvenile Law § 31-37-5-3

Sec. 3. (a) If a child is not taken into custody under an order of the court, the law enforcement officer may release the child or may release the child to the child's parent, guardian, or custodian upon the person's written promise to bring the child before the juvenile court at a time specified.  Subject to subsection (c), the law enforcement officer may place the child in detention if the law enforcement officer reasonably believes that:

(b) If a child is detained for a reason specified in subsection (a)(4) or (a)(5), the child shall be detained under IC 31-37-7-1.

(c) Unless a law enforcement officer determines that detention is essential to protect a child or the community, the law enforcement officer who detains a child for a violation of the curfew law under IC 31-37-3 shall make a good faith effort to release the child to the child's parent, guardian, or custodian within a reasonable time after the child is detained.