A living will can be broken in the following instances.Your appointed representative has the authority to make decisions for you, including those that may go against wishes you've stated in your living will. It's important to appoint a representative whom you trust.Your state might consider a living will invalid for a number of reasons. If you don't have the proper witnesses, have previous wills that haven't been destroyed, your mental state is questionable, or a court finds that fraud influenced your will, the decisions you made in your Living Will may not be followed.