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My brother was caught stealing money for alcohol at work. When questioned about it, he admitted he had substance abuse and mental health problems and needed help. They refused because they said they had a zero tolerance policy. A union rep was present for this. Is there a case here?
If your brother is part of a union then he has is not allowed to sue in civil court and has to get the union to file a grievance for him against the employer. His only other option would be to file a human rights complaint with the human rights tribunal.