A.
Any person under legal age to purchase alcoholic beverages who, without legal authority, knowingly possesses or knowingly consumes any alcoholic beverage in or on any school property, public conveyance, public place or place of public assembly or on private property shall be subject to a fine of $250 for a first offense and $350 for any subsequent offense; perform community service for a period not to exceed 180 days; at the discretion of the court, have a New Jersey driving privilege suspended or postponed for six months; and, if considered necessary by the court, be referred to an alcoholic treatment program at the defendant's expense.