License to Drink

Here’s an idea that will probably never be considered since it makes sense: to counteract abusive drinking by young adults under the age of 21 lower the drinking age.
The suggestion is to lower the drinking age but have the would be drinkers obtain a license to do so similar to allowing them to drive at 16. Check out the following for a full discussion of this:
http://health.usnews.com/usnews/health/articles/070410/10health.mccardell.htm