there is a beer that had 3.2% alcohol which (at one time, anyway) the
young ones between 18 and 21 years old could drink. Coors in Colorado made this and the "kids" were happy to have (three point two) although you had to drink enough to float away before feeling any effects from it. There were a lot of trips made across state lines...to get to Colorado for the chance to get some! (you don't suppose the Coors beer lobbied for the laws to allow it to be served in their home state??!!)
http://en.wikipedia.org/wiki/Low-alcohol_beer