If the drug test was for a D.O.T. test (dept. of transporation) then there is a data base of failed drug results that they can pull records from. If the test was done for some kind of security clearance job then there may also be something from there.
)You can't be fired for failing a pre-employment screening as you haven't gotten the job yet.) You can be fired for fraud, for not telling the truth about failing the test if they were to find out. Same thing as not answering the question. Ommission is the same thing as not telling the truth.Answer 2
It depends. If the test was for military or law enforcement it might show up on a background check. If it was for a private employer no they would not be able to find out.Answer 3
No it will not show up. Next time, dont