I would have to think that if he were undergoing some kind of treatment like that he would have most likely had his team medical staff in on it, they would likely know what he was doing, and then get permission for the medication. Comes across to me as something illicit, otherwise why not just get with the league and let them know what you are doing and validate it doesn't violate the policy, and at the very least let the league know ahead of time so it isn't found in a random drug screen. Then I seriously doubt you are looking at a suspension, maybe just a simple "out for medical" DNP of some kind. Yeah this is way fishier than just a "trying ketamine for my depression" kind of thing.