By SERGE F. KOVALESKIAUG. 9, 2014

Above:

Nearly four years ago, Dr. Sue Sisley, a psychiatrist at the University of Arizona, sought federal approval to study marijuana’s effectiveness in treating military veterans with post-traumatic stress disorder. She had no idea how difficult it would be.

The proposal, which has the support of veterans groups, was hung up at several regulatory stages, requiring the research’s private sponsor to resubmit multiple times. After the proposed study received final approval in March from federal health officials, the lone federal supplier of research marijuana said it did not have the strains the study needed and would have to grow more — potentially delaying the project until at least early next year.

Then, in June, the university fired Dr. Sisley, later citing funding and reorganization issues. But Dr. Sisley is convinced the real reason was her outspoken support for marijuana research.

“They could never…