Legalize abused drugs, including methamphetamine?

In The Washington Post yesterday morning, George Will comments on drug legalization.  He doesn't specifically mention methamphetamine--the focus is on cocaine and marijuana--but, is legalization or decriminalization of methamphetamine a viable policy?

Reference: Will GF, The legalization dilemma, The Washington Post, April 4, 2012

Associated Press - National Meth Lab Busts Up in 2011

From the Associated Press...

Methamphetamine lab seizures rose nationally again in 2011, further evidence that the powerfully addictive and dangerous drug is maintaining a tight grip on the nation's heartland, according to an Associated Press survey of the nation's top meth-producing states.

Do these findings reflect a decrease in methamphetamine use nationwide?

Reference - National Meth Lab Busts Up in 2011. Jim Salter, Associated Press cited in the Columbia Missourian, Feb. 22,2012