This is not a medical blog, but medicine and the law interact extensively when it comes to determining (or challenging) a person’s legal capacity.  To prove lack of capacity requires evidence of a mental defect, such as dementia or Alzheimer’s disease.  Alzheimer’s also plays a role in proving a weakness of mind—required for undue influence.

Lack of capacity is probably the most used concept in trying to overturn a California Will or Trust.  And while nearly ever Trust or Will contest lawsuit contains an undue influence allegation, undue influence is usually minimized or even ignored altogether at trial.  In this vide, Keith A. Davidson discusses how both concepts can be