Marijuana legalization raises safety questions

The Seattle Times (US)
Tuesday, February 12, 2013

Marijuana may be coming out of the black market in Colorado and Washington state, but the drug, at least for now, will retain a decidedly underground feel: Users may not know what's in it. Less than a year away from allowing pot sales, regulators are grappling with how to ensure that the nation's first legal marijuana industry will grow weed that delivers only the effects that pot smokers want.