KNOW IT WHEN YOU SEE IT
Supreme Court Justice Potter Stewart wrote in an opinion on a first amendment, free speech issue that became famous, but is so commonplace and true about life. Specifically he said that some things are hard to define, but he would know he if he saw it. That same sentiment holds true for so many things in life and the law. Many times certain phrases, concepts or principles can be reduced to a canned or trite definition but still better expressed as the kind of thing that you know it when you see it. The principle of undue influence of a testator creating or amending a will is the type thing that could best be defined as such. For certain courts and legislatures created any number of definitions, but life has a way of finding another set of circumstances that do not fit any such definition but is undue influence just the same. Indeed New York state’s standard jury instructions on the issue of undue influence and duress comes from a case that specifically states that undue influence is difficult to define. Despite the limitations, a good working definition is when the testator was unable to exercise independent action and the person exercising the influence made the person do something against their free will and desire. Charm, ties of affection and past kind acts are not enough. Instead the actor must engage in an act of coercion to make the actor do what they would not otherwise do. Some Courts even broke the definition of undue influence down even further, by stating that it can even be found when a testator believes what the influencer wants them to believe, without even knowing that the influencer asserted their will over them.
There are certain hallmarks that are common with issues of undue influence.