CHICAGO (AP) — A hearing in Chicago will deal with the tricky question of whether scientific evidence supports military veterans with post-traumatic stress disorder using marijuana to manage their symptoms.

Monday’s hearing is a step toward expanding the Illinois medical marijuana program to include PTSD and other conditions.

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An advisory board made up of patients, nurses, doctors and a pharmacist will hear testimony. The board will make recommendations to the Illinois Department of Public Health.

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Supporters of marijuana research say federal obstacles make it difficult to provide solid evidence. They include Dr. Sue Sisley, an Arizona investigator pursuing a study that’s on track to be the most rigorous trial so far of marijuana for veterans with PTSD.

Sisley has come to Chicago and has requested a meeting with the Department of Public Health.

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