If your employer disclosed confidential medical information, which drug tests may be considered, to your co-workers, then you may have claims under Wisconsin law for that wrongful disclosure of private information. If the termination is somehow due to the employer's disclosure of the information, then perhaps one can argue for damages resulting from the termination. Sometimes, the disclosure of confidential medical information can invoke protections and remedies under the Federal Americans with Disabilities Act even if the employee does not have a disability. The analysis and resulting remedies are all very fact specific. I recommend that you contact an attorney licensed in Wisconsin that handles employment matters to discuss what happened and what remedies you may be able to pursue.