For the first time in 20 years, a federal court will review scientific evidence on the therapeutic value of marijuana, as a legal challenge by a group of doctors, medical professionals and patients makes its way to the U.S. court of appeals in Washington, D.C., next week.

Americans for Safe Access is hoping the challenge will change the government's classification of marijuana from a dangerous drug with no medical benefits, the Guardian reported. Other groups, such as the American Medical Association, the American College...