Polydrug Use, Cannabis, and Psychosis-Like Symptoms

Much of the purported link between marijuana use and psychosis is based on correlations between marijuana use and schizophrenia-like symptoms or traits, called “schizotypal personality.” But this study suggests that the effects of other drugs also used by...

The Evidence Base for the Classification of Drugs

As part of its evaluation of Britain’s system for classifying illicit drugs, Parliament commissioned the European branch of RAND Corporation, one of the world’s most respected think-tanks, to study the evidence underlying the classification of several...