<p>Medical marijuana clone plants at a medical marijuana dispensary in Oakland, Calif., Feb.1, 2011.</p>
June 24, 2015
Stories this photo appears in:
June 24, 2015 9 p.m.
Study: Scant evidence thatmedical pot helps many illnesses
CHICAGO - Medical marijuana has not been proven to work for many illnesses that state laws have approved it for, according to the first comprehensive analysis of research on its potential benefits.