Your question is not clear, I think you are asking about when are juveniles (under 18 yoa) released into someone else's custody (an adult's custody) rather thatn being sent to a juvenile lockup???  No one is released to the custody of a juvenile (under 18 yoa).

First off I would strongly recommend you post and introduction and tell us a little about yourself.  To answer your question there is not a list of offenses for which releasing someone apply.  I would assume yo were released on a citation.  This is not unusual for a number of offenses.  Now with a DUI we can't cite and release you out to the street.  since you are impaired we must find a responsible adult who is willing to take the responsibility to see that you don't do something stupid. 

introduction would be appropriate, and it depends on jursdiction and agency policy, many agencies a OVI would be automatic jail (probably for 12 hrs), do not want the potential laibiity of releasing the individual , even to a responsible adult.  Post your introduction here: http://policelink.monster.com/discussions/130-introductions/topics