The issue of drug addiction has reached a point where consumption has become a social necessity. And so things you can imagine the near future with a growing number of addictions that we can not rely or priests (if any left).
high-risk professions such as medical, public transport driver, pilot (air, rail or sea), police, construction workers, laboratories, etc., have in their ranks consumers ¬ suitable for blunt noses. So, each draw their own implications and decide whether you want a society in which we will not know who to trust. Either that, or more stringent criminal laws that force professionals from high-risk groups - the majority - to undergo periodic reviews and analysis in order to ascertain their state of reliability .