The problem with "blue laws" such as this one, are that they are made by those who are relativly unaffected by it, and couldn't care less about who it does affect. I will never figure out why alcohol and cigarettes are legal, but not marijuana, not even more medicine. But, back on track, we are one of the only countries (possibly the only) with a high drinking limit (21), and a low driving limit (16). Strange. My history teacher told us that the age 18 age was changed because of MADD in the late 1970s. Something about MADD offering money to any state that changed it. Very persuasive thing, money...
