I was curious about the waiver of liability. I was wondering if someone signed a name that was similar to their name but wasn't their name, would this void the "contract"? Additionally, I know that a release of liability does not apply when gross negligence is exercised by the (eg) examiner.  For example if I were to sign a release before surgery and the doctor left instruments in my body, he or she is still liable. Would I have a cause of action if I could prove gross negligence. Could I attack the institution of Polygraphs and prove in court the lack of viability regarding the polygraph and show the jury or court that the examiner is aware of this lack of viability, or something along these lines?