Your best defense against past drug use is time. Don't do ANY illegal drugs, period. The more time you put between your application and your last drug use the better. A year or two probably won't cut it. We are talking several years of clean living, to prove you are serious.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.