Undue influence in Florida is a cause of action used to challenge the validity of atestamentary document, whether a Last Will & Testament or a Trust. As the Second District Court of Appeal in Florida noted, “undue influence, as it is required for invalidation of a will, must amount to over-persuasion, duress, force, coercion, or artful or fraudulent contrivances to such a degree that there is destruction of the free agency and will power of the one making the will. Mere affection, kindness or attachment of one person for another may not of itself constitute undue influence.” Heasley v. Evans.