Anyone can buy hallucinogenic salvia online or at a local head shop. The DEA and others want to limit its use, but scientists say making it a controlled substance would hinder research.
It's been almost 50 years since a generation of young people were urged to "turn on and tune out" with the aid of psychedelic drugs. But at least one hallucinogenic drug remains legal and widely available -- and it's become popular with today's teenagers.
