No. What I do in my own time is not the business of my employer.
THC can stay in detectable levels in one's bloodstream well after its effects have worn off -- several days in fact.
If an employer suspects that something, perhaps drugs, is negatively affecting an employee, then an employee can be warned/dismissed based on the fact that they are working with diminished capacity. Employers do not have the right to their employees bodies to determine what it is, but employers can hold suspicions. However, employers should make any suspicions abundantly clear ('we think it is drugs'), and an employee can voluntarily get a blood or other test to challenge any suspicions or dismissals.
Actually having or dealing drugs at work, however, is a much more serious issue, assuming they are illegal.
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