A funny thing happened on Monday. The Department of Justice filed a brief regarding state medical marijuana laws in Arizona . . . and it was a good thing, and was met with appreciation from the medical marijuana movement! Seriously. After the disappointments of the vague, not very helpful Cole memo, and the expected but still disappointing DEA denial of marijuana’s medical value, it was great to see the Department of Justice (DoJ) doing the right thing regarding medical marijuana, even if it was…