My friend had a promising job that lasted 5 months until another employee wrongly reported that he was smoking cannabis on the work place premises.

He was then fired by employer for drug use. My friend denied the accusation, offered to be drug tested, and asked employer to review his surveillance footage to prove he was not using drugs on company property.Employer was aware that my friend was a casual cannabis user outside the workplace also. My friend has been unable to find a job one year later, and the person who reported him took his job. Does he have a case in Minnesota? There is more to story, like following that he did have drug test for another job that did not work out, and that drug test was clean. If he has a case, what recourse does he have? Any attorney recommendations would be helpful if contingency case.