At the end of August, 296 days after voters in
Colorado and Washington decided to legalize marijuana, the U.S.
Justice Department responded with a memo that leans toward
accommodation rather than confrontation. As Jacob Sullum explains,
they did so because had no viable way to stop it.
from Hit & Run http://reason.com/blog/2013/11/21/jacob-sullum-on-tolerating-pot-with-a-fr