I know a lot about this topic. feel free to pm me if you like. when you apply for an m.d. license, there is a section that asks for whether or not you have ever been treated for a substance problem. If you check yes. You can still get a license..however it will be slightly delayed and you will have to develop a relationship with a third party department (usually hired by the state) who deals with monitoring health care professionals. There is lots of extra documentation required of past treatment and compliance, third party recommendations (i.e. 1-3 years or monitored recovery within residency training or even practicing- random drugscreens, group meetings, AA meetings and attendance)...recommendations which the state that gives you your license will follow and conditionally give you a license. then their is your GME office at your training institution who will further want to examine your paperwork. Lots of hoops...but its done to allow healthcare professionals to enter back into their line of work while protecting that individual and patients from the harm of relapse. It can be frustrating at times...however, in the past...people were just kicked out of schools, hospitals, training programs. Now...if you are compliant and sober...you are not limited in anyway.
hope this helps