'FS' yr posts are quite informative, again tnxs.
It would be a fair chance that pilots over the years have stepped into the 'office' with some alcohol/drugs still in their system known or unknown. Like aircraft with contaminated fuel/oil it does happen at times & will continue happening as long as there are humans involved. Just how we handle these future events by way of random testing etc is the area in question & also how to educate so that the risk is kept to an absolute minimum.
At the very least this debate/discussion is promoting awareness of something that has no doubt been around since the Wright bros.
CW