That may vary depending on the state. My company fired me with an explanation that I violated company policy They had no evidence that I did anything (which I did not) and the three lawyers I spoke with said I had no case. The company could fire be for cause, no cause or any cause they made up, true or not. So long as they did not violate my civil liberties they could do what they wanted to. And even if they did it would be difficult at best to prove it unless the company were stupid enough to put it in writing. Then there was the Texas Workforce Commission. They are sup[posed to be an advocate for the employee but all they are is a yes man department for big business here in TX. Employes have no rights here. The only way you have protection is if you are contract or are in a union. Then who will protect you from the union. It's a screwed up situation.