This Brief explores emerging trends in drug use and distribution. This timely Brief examines recent examples of emerging drugs including salvia (from the plant Salvia divinorum), bath salts (and other synthetic stimulants) and so-called research chemicals (primarily substituted phenethylamines, synthetic cousins of ecstasy), which have tended to receive brief levels of high intensity media coverage that may or may not reflect an actual increase in their usage. Over the past decade in particular, "new" substances being used recreationally seem to come out of obscurity and gain rapid...