How will an arrest for possession of narcotics that got dismissed completely affect your application and licensing to a state bar? What if you apply to have the arrest sealed and destroyed, do you still have to report on your bar application??
I practice law in Washington but I have no doubt that you must tell the truth in your application to join the bar even about unfortunate things. If the matter is of little consequence at this point in time it is likely that the Bar Association will overlook it. You should check with the Bar Association in question and should probably be able to do so without identifying yourself.