Since a 1994 Colombian Supreme Court ruling that held criminalizing drug users violated their privacy and autonomy, drug possession has not been a crime in Colombia. But President Álvaro Uribe -- personal abstainer, ally of the US, and recipient of billions in US anti-drug assistance -- tried to recriminalize drug possession during the 2006 presidential election campaign, and now, the Global Post reported earlier this month, he's trying it again.

Under that 1994 ruling, adults may possess up to 20 grams of marijuana, two grams of Ecstasy, and one gram of heroin or cocaine in the privacy of their own homes. It is not, however, a get out of jail free card. In practice, Colombian police are known to charge simple drug possessors with intending to distribute drugs.

Still, the law provides some protections to drug users, and users are mobilizing to defeat the rollback effort. At a recent demonstration outside the presidential palace, pot smoke wafted through the air as protestors made their opposition clear.

"Taking drugs is a private matter," said Daniel Pacheco, 27, a Colombian journalist who helped organize the march. "There are a lot more important things that the government should be concerned about."

Álvaro Uribe Vélez

"It's not right for the country to have this ethical contradiction of being severe when it comes to drug production and smuggling, but totally lax and permissive when it comes to consumption," Uribe said in a speech in February.

Still, it is unclear whether even his own administration supports the move. Attorney General Mario Igaurán said recently that the government should focus on high-level drug traffickers rather than worrying about what people do in the privacy of their own homes. And health experts question whether the measure will be effective in getting people into treatment or having success with coerced treatment.

Uribe and his hard-line stance on drugs are increasingly isolated in Latin America. With Peru, Ecuador, and Brazil relaxing some drug laws in recent years, with Argentina threatening to decriminalize drug possession, and with the Mexican Congress this week hosting a debate on legalization, Uribe seems the committed contrarian, marching boldly backward into the dark days of the 20th Century.