http://www.nolo.com/legal-encyclopedia/employment-at-will-definition-30022.html
Are You an At-Will Employee?
The law generally presumes that you are employed at will unless you can prove otherwise, usually through written documents relating to your employment or oral statements your employer has made.
所以我回答樓主的是,“一般說來”沒有問題。但是誰知道樓主簽的是什麽東西。