No, the constitution protects you from the government searching you and so on against your will. My dad's factory is not a government agency, and you provide your urine of your own free will. He can't make you. You have a choice!!!!! He just won't hire you. No law against that. As an employee, think of yourself as a tool
Ummmmmmmmm...no thanx, you enjoy your status as a "tool"...I'd rather be poor...