drug testing is fair enough if you are using drugs before going to or during work, but if you are just sitting in the lounge at home after work in the evening having a quiet puff i do not really agree with it. someone else can go home drink large amounts of alcohol and still be over the legal drink driving limit the next day and go to work with no testing at all. people hung over at work can be more dangerous than someone who puffs on a joint 10 hours before they go to work.
hmmm
An Evidence Based Review of Acute and Long-Term Effects of Cannabis Use on Executive Cognitive Functions