The Food and Drug Administration has approved an injectable drug designed to treat people addicted to opiates who have undergone detoxification treatment. Vivitrol, made by Massachusetts drug maker Alkermes, is a so-called extended-release formulation of the drug naltrexone that is injected once a month into the muscle, according to an FDA statement. The drug works to block opioid receptors in the brain.

Researchers at the University of California Los Angeles say they’ve come up with an implanted device that administers the medication buprenorphine, which helps end dependence on heroin and opioids that are found in many prescription painkillers.

A Mexican police commander investigating the reported shooting of an American tourist on a border lake was decapitated and his head was found in a suitcase outside a Mexican Army base.

Marijuana in Montana isn't just for legal medicinal or unlawful recreational purposes - it's also a booming business. That message was loud and clear among caregivers and others who attended the Medical Marijuana Growers Association gathering in Helena this week.

A decade ago, they were a small group of elite Mexican soldiers who saw a chance to make a lot more money working as hitmen for powerful drug trafficking organizations. Today, the "Zetas" are the most feared gang in Mexico. Their vicious tactics, geographic reach and expansion into new illegal businesses presents a new kind of threat in a drug prohibition war that has already killed 29,000 people since late 2006.

The search continues for the body of a tourist, David Hartley, believed to have been killed on a Texas lake, which separates the United Stated from Mexico. Friends and family of Hartley held a memorial service for him, without his remains.