In any sport, if you are proven to have knowingly taken performance enhancing drugs, you should be banned for life.

If you fail a drugs test, but there are extenuating circumstances - is you took an over the counter medication which contained a banned substance, or if your samples were not properly secure,then you should get a 'yellow card'. Two yellow cards should mean a life ban.

This is especially true in a sport like boxing, where your opponent's life could be endangered by your cheating.