Just to make things easy, here’s the article Blackjack pointed to:
(Notice the parallel with gambling ads)
WASHINGTON — The American Civil Liberties Union and three drug advocacy groups have won a legal battle over advertising that promotes marijuana.
MEDICAL MARIJUANA
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A Washington federal judge declared unconstitutional a law restricting transit-system ads that support the medical use or legalization of marijuana. Congress had passed the legislation earlier this year. It calls for denying federal transportation money to Metro and other transit agencies if they accept ads promoting the legalization of drugs. The law cuts off more than $3 billion in federal funds to communities that allow such ads.
Federal Judge Paul Friedman said the statute is unconstitutional because it violates free speech.
The ACLU and the other groups sued after Washington’s Metro system refused to display ads they had submitted, saying it could lose millions in federal funds.
The government argued that the law is justified because it serves to deter illegal drug use.
Metro officials say they’re still reviewing the judge’s ruling.