littlehurcules - I want to point something out that I didnt make clear
Common sense you dont take drugs and be under the influence.
What I mean is the 'hard' drugs, with the likes of Cocaine, ice etc.... Not the every day headache tablets, cold & flu - thats fine.... There must be acceptable standards and tolarations for the body to take in the effect of traces of codine [found in headache tablet's]
Doesnt mean your nicked, if you fail a drug test..