At least some in the international news media have belatedly discovered a study casting doubt on the purported link between marijuana use and schizophrenia. I say “belatedly” because the study was published online back in June, although the print version came out this month. A group of British researchers examined a rather basic notion: If marijuana use  causes schizophrenia, then a major increase in marijuana use should lead to an increase in schizophrenia diagnoses in the following years. In an…

We’ve all heard the claims before – from federal officials, police groups opposing state medical marijuana bills, etc. – that there is no evidence that marijuana is a legitimate medicine. Readers of this blog know that’s nonsense, but there’s been a need for an article in the peer-reviewed scientific literature that lays out the scientific case in a clear, tightly-focused way. Recently, a group of scientists published a review article in the Journal of Opioid Management that does just that. The article,…

Earlier this week, Gov. Arnold Schwarzenegger (R-Calif.) launched MyIdea4CA.com, a website which encourages Twitter users to “tweet” their ideas for how to “move California forward” and then allows visitors to give each of those ideas an up or down vote. The site has only been live for a few days and already the top three most popular “tweets” involve making marijuana legal, taxed, and regulated in California. It is encouraging that high-level pols like Gov. Schwarzenegger and President Obama are…

The Obama administration’s official position on the movement to decriminalize drug use in Latin America is to take a “wait-and-see attitude.” However, San Diego Police Chief William Lansdowne was willing to share his thoughts with the Associated Press: "Now they will go [to Mexico] because they can get drugs. For a country that has experienced thousands of deaths from warring drug cartels for many years, it defies logic why they would pass a law that will clearly encourage drug use." His quote illustrates…

Argentina is expected to remove criminal penalties for marijuana possession today, according to the Buenos Aires Herald: Supreme Court Justice Carlos Fayt said the court has reached a unanimous position on an expected ruling that would decriminalize the possession of drugs for personal consumption, which would be announced analyzed today. If the court rules as expected, Argentina will become the second Latin American country in the last four days to allow the personal use of marijuana.

Last week, Mexico passed a new law decriminalizing simple possession of marijuana and other drugs. Perhaps our neighbor to the south will now consider the possibility of full legalization (regulating marijuana like alcohol, as opposed to simply removing penalties for possession). A number of people in Mexico are calling for a debate, with  former President Vicente Fox as one of the most prominent voices in that chorus. However, others are wondering if legalization in Mexico would make a difference.…

A study just published online by the journal Neurotoxicology and Teratology suggests that marijuana may protect the brain from some of the damage caused by binge drinking. The study, by researchers at the University of California San Diego, used a type of high-tech scan called diffusion tensor imaging to compare microscopic changes in brain white matter. The subjects were students aged 16-to-19, divided into three groups: binge drinkers (defined as having five or more drinks at one sitting for boys…

Mexico enacted a law decriminalizing possession of marijuana (and other drugs) yesterday, according to the Associated Press. The new law defines 5 grams of marijuana as a “personal use” amount. People caught in possession of less than that amount will face no penalty until their third offense, at which point the law requires them to enter addiction treatment. The change is part of the Mexican government’s efforts to fight a very hot war against drug cartels along its border with the U.S. By decriminalizing…

MPP's director of state campaigns, Steve Fox, is the co-author of a new book entitled, Marijuana is Safer: So why are we driving people to drink? The purpose of this book is to educate Americans about the relative harms of marijuana and alcohol, and to force them to consider why we punish adults who use the less harmful substance.  The critically acclaimed book also provides supporters of marijuana policy reform with the information and talking points necessary to spread the "marijuana is safer"…

Among the more interesting pieces of news that came out while I was on vacation the first half of August was a new study in the journal Cancer Prevention Research, which found that marijuana smokers have a lower risk of head and neck cancers than people who don't smoke marijuana. Alas, this important research has been largely ignored by the news media. While this type of study cannot conclusively prove cause and effect, the combination of this new study and existing research -- which for decades…