molecules

Add marijuana to humans, and you get some fairly predictable results: euphoria, hunger, introspection, anxiety, and a whole panoply of other effects. Also known as being high. Most of that complicated reaction is thanks to a single cellular structure known as cannabinoid receptor 1. Your body...

Marijuana is now legal for recreational or medicinal use in at least 28 states and the District of Columbia. But driving under the influence of marijuana is illegal no matter which state you're in. To enforce the law, authorities need a simple, rigorous roadside test for marijuana intoxication...