where I work they do random drug testing. I have been tested 2 times recently. I believe the drugs they are concerned about are alcohol, marijuana, narcotic pain killers, etc, but not medication used to treat specific conditions such as parkinsons. I told my boss I had parkinsons when I was diagnosed but I had been working here for awhile. In your case, since you haven't officially been diagnosed I would not volunteer that information at all unless asked. It should not effect your employment and ability to work hopefully for a long time. There are alot of people working with parkinsons, ms, and other conditions. More power to you. The work should keep you mentally stimulated and be good for you physically. I would be excited too if I were in your shoes. Good luck with your schooling.