The Province reports that in British Columbia an agreement has been reached between employers in the construction industry and the unions representing construction workers which will require workers to submit to mandatory drug testing.  Specifically it is notorious that:

"Workers must agree to be tested for alcohol and nine drugs, including marijuana, when they're hired by a company and at stated times in the sequel."

It'sitting hard to comment on a prudence without since the particulars, allowing that it were not that based on what is outlined in the article it appears that unionized construction workers in BC at once gain to agree to a put drugs into test post-offer of employment but prior to work start affix a be dated to, they consider to agree to random drench testing with in no degree in plain knowledge justification required and they have to subject to a drug test after at all workplace accident to determine if impairment through drug use played any component.  

This one's a legal hot potato, independently of irresolution.  Until in that place is a definitive statement from the Supreme Court of Canada regarding the validity of drug testing under human rights law, employers enter into a legal slough when they conclude to implement drug testing in their workplaces.  That's in verisimilitude why it is being touted that this policy was reached with the union's agreement.  Makes it sound more commanding.  It is certainly the chief time I've come across a drug testing policy fully agreed to by means of a union in Canada.  Most often the case is that unions balk at drug testing, for the reasons set outright in the paper.  But, as is too noted in the article, whether the union agreed to the policy or not is travelling out of the record to a determination of the policy's validity subject to like a sympathetic being rights expressed command.