You can now read 10 articles in a month for free on BostonGlobe.com. Read as much as you want anywhere and anytime for just 99¢.

The Boston Globe

Health & wellness

Law, policy thwart research on marijuana

Massachusetts voters in 2½ weeks will consider becom­ing the 18th state to ­legalize the use of marijuana for medical purposes. But there is little research showing whether the drug has therapeutic benefits.

That says more about the difficulty of studying an illegal substance than it does about the inherent medical value of the plant.

Loading comments...

You have reached the limit of 10 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week