Unsurprisingly, one of the leading Teenage and Juvenile Crime involves alcohol. Although illegal at the time, teenage drinking for those of us who grew up in the 1980s was hardly the big deal it is in today's criminal justice system. "Back in the day", police officers exercised discretion and either poured it out, or (I assume) took it back to the station for after the shift. If you were really unlucky in the 80s, the police took you home and you had to face your parents.
In any criminal prosecution involving allegations that the defendant committed a violent crime such as aggravated assault or murder, important issues such as intent, self-defense and witness credibility come into play. In many cases, competing versions of events must be considered, and this issue is very likely to arise in domestic violence cases.