In some ways, 2012 has been a year of dramatic, exciting change in drug policy, as the edifice of global drug prohibition appears to crumble before our eyes. In other ways it is still business as usual in the drug war. Marijuana prohibition is now mortally wounded, but there were still three-quarters of a million pot arrests last year. The American incarceration mania appears to be running its course, but drug arrests continue to outnumber any other category of criminal offense. There is a rising international clamor for a new drug paradigm, but up until now, it's just talk.

The drug prohibition paradigm is trembling, but it hasn't collapsed yet. -- we are on the cusp of even more interesting times. Below, we look at the biggest drug policy stories of 2012 and peer a bit into the future:

1. Colorado and Washington Legalize Marijuana!

Voters in Colorado and Washington punched an enormous and historic hole in the wall of marijuana prohibition in November. While Alaska has for some years allowed limited legal possession in the privacy of one's home, thanks to the privacy provisions of the state constitution, the November elections marked the first time voters in any state have chosen to legalize marijuana. This is an event that has made headlines around the world, and for good reason -- it marks the repudiation of pot prohibition in the very belly of the beast.

And it isn't going away. The federal government may or may not be able to snarl efforts by the two states to tax and regulate legal marijuana commerce, but few observers think it can force them to recriminalize marijuana possession. It's now legal to possess up to an ounce in both states and to grow up to six plants in Colorado and -- barring a sudden reversal of political will in Washington or another constitutional amendment in Colorado -- it's going to stay that way. The votes in Colorado and Washington mark the beginning of the end for marijuana prohibition.

2. Nationally, Support for Marijuana Legalization Hits the Tipping Point

If Colorado and Washington are the harbingers of change, the country taken as a whole is not far behind, at least when it comes to public opinion. All year, public opinion polls have showed support for marijuana legalization hovering right around 50%, in line with last fall's Gallup poll that showed steadily climbing support for legalization and support at 50% for the first time. A Gallup poll this month showed a 2% drop in support, down to 48%, but that's within the margin of error for the poll, and it's now a downside outlier.

Four other polls released this month demonstrate a post-election bump for legalization sentiment. Support for legalization came in at 47%, 51%, 54%, and 57%, including solid majority support in the West and Northeast. The polls also consistently find opposition to legalization strongest among older voters, while younger voters are more inclined to free the weed.

As Quinnipiac pollster Peter Brown put it after his survey came up with 51% support for legalization, "This is the first time Quinnipiac University asked this question in its national poll so there is no comparison from earlier years. It seems likely, however, that given the better than 2-1 majority among younger voters, legalization is just a matter of time."