You assume that someone who smokes in his off hours will show up to work stoned. Just because someone has a few drinks after work doesn’t mean they go to their job drunk.
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Do you know the after effects of smoking pot? It stays in your system for days and weeks. You may not be high, but you are impaired.
Responsible employers have the right and the duty to fire all dopers.
It does stay in your system for weeks, but in amounts too tiny to impair you. It's as if you had .0001% alcohol in your system weeks after you had a couple drinks.