Some good points. Like i said my personal concern is a matter of privacy and the right to have a personal and private life away from work. I would NEVER dream of smoking anything while at work, not even a cig, in the same way i would never drink alcohol at work EVER.
Pot/Grass/hash is NOT addictive, this has been medically proven many times. The act, ritual and "scene" around it can be addictive tho as well as the nicotine in the tobacco if you mix it like that. Recent reports state it in no way permanently alters the brain or intelligence of regular smokers as long as they do not start before the age of 18. Under 18's who smoke do lose some brain function which IS permanent. Given the effects or "high" from a joint last maybe 2-4 hours at most i would say it is comparable to alcohol. The differemce is alcohol cannot be detected after 12-14 hours where THC from cannabis stays in the fat cells of the body fkr anywhere from 2 days to 30 days plus. This does not mean you are high for 30 days or in ANY way affected once the high wears off, its just in your fat cells so will be detected in your urine as it leaves the body after being broken down, the brain is NOT under the influence during this time.
I am 100% behind testing ANYONE who appears stoned, drugged or drunk at work, a blanket testing of ALL employees is just wrong tho as far as i am concerned. It is also a violation of our privacy and rights to a private life outwith work. Imo.
If any employee has a problem with drink or drugs it is apparent thro them taking time off, being late more often, making mistakes at work or acting oddly, these folk can be tested if suspected of having a problem, why test us all?
I know guys in their 50's & 60's who smoke a spliff most nights after dinner and just chill at home, they NEVER miss a day at work, ALWAYS produce great work and have no problem with concentration or any other issues. These guys will fail a test tho they are NOT under the influence while at work EVER.
At the same time i know many people who go straight to the pub after work, drink for 2-4 hours then go home pretty smashed 3-5 nights per week, they often miss days due to hangovers or sleep in due to alcohol the night before. These guys will pass any test as they are NOT under the influence at work either but have a far bigger problem imo.
A single spliff every few months harms no-one but it could lose a good worker his/her job. Different if they are permanently stoned and a complete "space cadet" type i agree. Where i live alcohol is a far, far bigger problem and this is often stated by the police as well as doctors and surgeons.