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Andrew Sullivan points to this ESPN comment regarding NFL Offensive Rookie of the Year Percy Harvin:

Harvin was a controversial draft pick after he tested positive for marijuana use at the February scouting combine. But as it turned out, the biggest problem he encountered was an intensification of migraine headaches that has plagued him for much of his life.

Oh, I think I know what's going on here. First, Harvin gets in trouble for testing positive for marijuana. Now he's passing drug tests, but suffering from constant debilitating migraines. Sounds like the NFL has simply prohibited him from using the one medicine that effectively treats his condition.

The thing about marijuana and migraines is that it doesn't just relieve symptoms, it often stops the headaches from ever happening in the first place. I've spoken with many migraine sufferers who've found that even modest use of marijuana simply makes the problem go away. I discovered this for myself in my late teens and it changed my life. I used to wake up everyday wondering if by mid-afternoon, I'd be huddled in a dark room, half-blind, violently nauseous and knowing I'd be unable to function again for 12 hours. It was horrible, but it ended quite abruptly one summer, and it was only later that I came to understand why.

So I can't even begin to describe my frustration at watching a world-class athlete's career jeopardized by the NFL's ridiculous prohibition against marijuana. Banning recreational use is silly, but this is an outrage. If you don't want publicity surrounding marijuana use in professional sports, then stop testing the athletes for marijuana. If that's too much to ask, then at least create an exemption for cases in which a doctor recommends medical use. Believe me, this would generate next to no controversy, although substantial coverage ranging from neutral to positive would be almost guaranteed.

If the President of the United States can embrace a more reasonable medical marijuana policy, there's no reason the NFL can’t do the same.

I wonder if any of the researchers saw this coming:

The vaccine, called TA-CD, shows promise but could also be dangerous; some of the addicts participating in a study of the vaccine started doing massive amounts of cocaine in hopes of overcoming its effects, according to Thomas R. Kosten, the lead researcher on the study, which was published in the Archives of General Psychiatry in October.
…
Nobody overdosed, but some of them had 10 times more cocaine coursing through their systems than researchers had encountered before, according to Kosten. He said some of the addicts reported to researchers that they had gone broke buying cocaine from multiple drug dealers, hoping to find a variety that would get them high. [Washington Post]

Whoa, that's doesn't sound like any fun at all. I assume the researchers told these people not to bother increasing their dose. Stories like this are the reason I'm skeptical of drugs that block receptors for other drugs.