I would expect an applicant that discussed this PRIOR to the drug test would not likely have a problem.
One who came up with that excuse AFTER failing the drug test is likely to keep looking for work.
I’ve hired with drug screening, that was our policy.
So, if said applicant told you up front what the deal was, in detail, the failure of the drug test would not present a problem ( unless it was operating heavy machinery, or driving a truck )....?
Unfortunately, often the pleasant, well-liked ones we wanted to make Permanent, flunked the drug test.
I have no idea what that means, or what drugs were involved, but it was a surprise.