First, the bar owners must fully enforce the drinking age. Among the hordes of young people scurrying like lemmings to the weekend watering holes are comparatively few who are of legal drinking age. Next, the city council must do what it takes, financially, to staff adequately and to train the police force to be a consistent, competent and confident presence in all the potential trouble spots and specifically in the bars before there is trouble. You're getting what you're paying for, folks. Third, the police must be committed to prevention as the easiest cure by checking ID's in the bars, being present and not looking the other way until things get so bad that they can't ignore a situation already out of hand.
Enforcement is a state of mind as well as a set of skills.
Finally, the community as a whole must hold all of the above accountable, including itself by believing that this is truly a community problem not easily solved by any one segment of it. The price of inactivity and of buck-passing is in the long run higher than opening your eyes and being part of the solution. NFP has been proven over 99 percent effective in worldwide studies and has zero side effects. It is easy to learn, easy to use, inexpensive, lifelong, reversible, marriage building, and moral. People need to learn the facts about NFP, and this organization teaches that plus a whole lot more.