Although at-will implies that the employee has a job at the will of the employer, who is able to terminate for any reason or no reason at all, in practice the employer i limited in its right to fire without cause. At-will employees have the protections afforded by law. Employers often have good cause to fire people: incompetence, poor performance, insubordination, violation of company rules, excessive tardiness, excessive absences, or substance abuse on the job. The employer who has a justifiable reason and a well-documented case for termination can fire an employee, even one who has passed the probationary period. However, an employer who fires an employee without having a strong, well-documented case will have difficulty winning a wrongful discharge suit brought by the employee.