It depends on the specific details of your situation, however, an employer may be allowed to take disciplinary action against an employee who is on workers' compensation, including giving them points for time missed and ultimately firing them, if the employee is not able to perform the essential duties of their job or if their absences are causing significant disruptions to the business. You do have protected rights, however, so it's important to talk with an employment law attorney to determine if the disciplinary action was wrongful.