Under the Arizona law, a will can be deemed invalid in court if the requirements necessary for it to be valid were not met, For example, if the testator did not have a sound mind when they signed the will, or if there was any fraud or undue influence over the testator at the time of the signing. Also, if the will has been replaced by a most recent will. It’s recommended to always seek counsel from a specialized attorney to verify the validity of your will.