The American Legion is calling on the U.S. Department of Veterans Affairs to clear roadblocks threatening completion of a groundbreaking clinical study on the use of medical marijuana to treat post-traumatic stress disorder (PTSD) in U.S. military veterans.

The federally-approved study is being administrated by Dr. Sue Sisley, site principal investigator with the Multidisciplinary Association for Psychedelic Studies (MAPS), at the Scottsdale Institute outside of Phoenix, Arizona. The project is one of nine medical marijuana studies funded by historic grants from Colorado’s Health Department.

Scientists have almost completed research with 22 veterans and now need to screen 6,000 to 8,000 vets to enroll an additional 54 qualifying PTSD patients in order to move the study forward, The Cannabist reported at the end of August. However, Sisley and her colleagues say the Phoenix VA Health Care System obstructing patient recruitment efforts putting the future of the study in serious jeopardy.

Read the rest of this story at The Cannabist.