Patrick Nightingale

Seth Weing / AP

Eight medical schools, including the University of Pittsburgh School of Medicine, have been approved by the state to do clinical research on medical marijuana, Gov. Tom Wolf announced this week.

The move is an important one, advocates say, because of how federal drug laws have hindered research into the medical benefits of cannabis over the years.

The state’s Department of Health chose the schools as Certified Research Centers in a competitive process, said J.J. Abbott, a spokesperson for the governor.