You take medicine because it's supposed to be good for you.
Oregon voters made marijuana a medicine in the belief that it would help people.
But a recent investigation by The Oregonian (Oregon Live online) found holes in regulations and testing regimes led to the presence of pesticides in some medical pot.
Oregon Growers Analytical tests marijuana for pesticides and other contaminants.
Oregon reporter Noelle Crombie and OG Analytical's Rodger Voelker join us.
Video extra: Teresa Mahoney at Oregon Live produced a video explaining the highlights of the print reports: