If a student came to me and checked off epilepsy I would have to turn them down.I would not accept a medical release from a Dr.....they are a danger to themselves and to who ever they dive with.The person diving with them may put themselves in danger attempting to rescue this person.Does not take long to drown,so even if the seizure is a short one, it is too dangerous for all involved..Some people afflicted with this malady can sometimes sense the seizue coming on,so if driving a car they have time to pull over and stop the car.In diving that is a luxury that does not exist.A instructor can turn down students for any reason,there is nothing saying everyone has a right to learn to dive.I turned down one older woman who wanted to be certified to dive nitrox.Told her no way because she has no idea on depth/time she is in the water,always goes deeper than planed on.She just blindly goes on her dives and if it was not for having a pro dive with her she would be a statistic.