Eight British Cabinet ministers have admitted that they smoked marijuana in their youth, most of them “only once or twice” in college, which would be an atypical pattern. The revelations began with Jacqui Smith, the new Home Secretary, the equivalent of the attorney general. They also include the police minister and the Home Office minister in charge of drugs. The eight have been dubbed the “Hash Brownies,” in acknowledgment of Prime Minister Gordon Brown.

On Wednesday Brown announced that Smith would lead a government review of the laws on marijuana, specifically with reference to whether simple possession should be again grounds for arrest. (The law was eased in 2002.) Several leading Conservatives in the Shadow Cabinet have also acknowledged using drugs, and party leader David Cameron has emulated President Bush in saying that he’s not obligated to discuss every detail of his private life before he entered politics.

In the United States many leading politicians including Al Gore, Newt Gingrich, Bill Bradley, and Barack Obama have admitted using drugs, while Bush and Bill Clinton tried to avoid answering the question.

In both Britain and the United States, all these politicians support drug prohibition. They support the laws that allow for the arrest and incarceration of people who use drugs. Yet they laugh off their own use as “a youthful indiscretion.”

These people should be asked: Do you think people should be arrested for using drugs? Do you think people should go to jail for using drugs? And if so, do you think you should turn yourself in? Do you think people who by the luck of the draw avoided the legal penalty for using drugs should now be serving in high office and sending off to jail other people who did what you did?

And the same question applies to Sen. David Vitter, who has acknowledged employing the services provided by the “D.C. Madam.” Many people have compared Vitter to other politicians who engaged in adultery, or have mocked his commitment to “family values”–he has said that no issue is more important than protecting the institution of marriage from the threat of gay couples getting married. But the other politicians usually cited were not breaking the law when they had affairs, and Vitter’s hostility to gay marriage while cheating on his own is a matter of simple political hypocrisy. The more specific issue, as with the pot-smoking drug warriors, is that Vitter (presumably) supports the laws against prostitution. Yet he himself, while a member of the United States Congress, has broken those laws and solicited other people to break them.

Vitter should be asked: Do you think prostitution should be illegal? If so, will you turn yourself in? Or will you testify for the defense in the D.C. Madam case, asking the court not to punish Deborah Jeane Palfrey if it’s not punishing you?

I hope that Jacqui Smith, Barack Obama, and David Vitter will engage in some introspection and conclude that if they didn’t deserve to go to jail, then neither do other pot smokers, prostitutes, and their customers. They might decide that not every sin or mistake should be a crime. But they should not sit in the halls of power, imposing on others the penalties they don’t think should apply to them.