Testamentary Capacity Expert Witness and Forensic Psychiatrist
Independent forensic psychiatric analysis for attorneys in selected testamentary and related capacity disputes involving wills, codicils, trust instruments and amendments, beneficiary designations, and other estate-planning decisions.
What Is Testamentary Capacity?
In general, testamentary capacity concerns whether a person possessed the abilities required by the governing law to make or change a will at the time of execution. A diagnosis, forgetfulness, or apparent social composure does not answer that question by itself.
Bennett Blum, MD provides forensic psychiatric consultation and selected expert-witness services to attorneys handling disputed wills, trusts, amendments, beneficiary changes, and related estate-planning decisions. His analysis distinguishes diagnosis from function and considers the evidence supporting capacity, the evidence raising doubt, reasonable alternative explanations, and the material limits of the available record.
Whether an instrument is governed by a testamentary-capacity standard, a contractual or donative-capacity standard, or another legal test varies by jurisdiction and instrument. Counsel identifies the controlling law. Dr. Blum evaluates the psychiatric, cognitive, functional, and behavioral evidence relevant to that standard.
This page is limited to testamentary and closely related estate-planning disputes. Questions involving contracts, gifts, financial decisions, medical consent, settlements, guardianship, or other legal acts are addressed on the broader mental-capacity services page.
Function at the Operative Time
Capacity is decision-specific and time-specific. It may fluctuate because of dementia, delirium, psychiatric symptoms, acute illness, medication effects, substance use, pain, sleep disruption, or other conditions.
Depending on the governing law, an analysis may consider whether the person could:
Understand the nature and consequences of the act;
Appreciate the property or interests affected to the degree the law requires;
Recognize the people and relationships the governing standard requires the person to consider;
Form and communicate a rational plan for the disposition of property, where the governing law requires it;
Retain relevant information long enough to use it in the decision.
The analysis may also consider whether psychiatric symptoms, cognitive deficits, or distorted beliefs materially impaired any ability required by the governing law.
An unusual, unwise, or unpopular estate plan does not by itself establish incapacity. Conversely, pleasant conversation, social polish, or orientation to person and place does not by itself establish the abilities required for a particular instrument.
Retrospective Testamentary Capacity Analysis
In many probate matters, the person has died, substantially deteriorated, or can no longer be examined. A retrospective analysis reconstructs mental and functional status from contemporaneous evidence.
That analysis should not project a later diagnosis backward or select isolated facts favoring one side. It requires a chronology anchored to the execution date and an assessment of how closely each item of evidence bears on the abilities required at that time.
Dr. Blum evaluates the clinical plausibility of lucidity, impairment, or fluctuation; whether documented symptoms affected the particular decision; whether the person’s stated plan and contemporaneous explanations remained consistent over time; and whether contrary evidence or reasonable alternatives weaken the proposed opinion. Where the record cannot support a reliable conclusion, that limitation should be stated plainly.
Evidence Commonly Reviewed
The relevant record may include:
Wills, codicils, trusts, amendments, beneficiary forms, and related drafts;
Prior estate plans and evidence of earlier stated intentions;
Estate-planning attorney notes, correspondence, execution records, and witness observations;
Medical, hospital, pharmacy, cognitive-testing, and psychiatric records;
Financial evidence bearing on the nature or complexity of the estate;
Emails, text messages, letters, recordings, and contemporaneous communications;
Depositions, declarations, interviews, and collateral witness accounts; and
Evidence of grief, dependency, isolation, fear, misinformation, illness, medication effects, or cognitive and psychiatric change.
No single diagnosis, test score, witness, or document ordinarily resolves the analysis. The weight of each item depends on its reliability, timing, specificity, and relationship to the challenged act.
How Dr. Blum May Assist Counsel
Depending on the matter, the work may include:
Early case assessment before expert designation;
Identification of missing records, witnesses, and factual questions;
Retrospective analysis at the legally relevant time;
Evaluation of supporting and contradictory evidence;
Evaluation of reasonable alternative explanations and material limitations;
Review of an opposing expert’s methods, report, deposition, or testimony;
Discovery and deposition consultation;
Preparation of an expert report when appropriate; and
Deposition or trial testimony in selected matters.
Early consultation may help counsel determine whether a defensible psychiatric opinion is possible before the case becomes committed to an unsupported theory. Not every dispute requires testimony, and not every disputed instrument presents a meaningful forensic psychiatric question.
Testamentary Capacity and Undue Influence Are Different Questions
Testamentary capacity and undue influence may overlap, but they are not interchangeable. A person may possess the abilities required to execute an instrument and still be unusually vulnerable to manipulation. A person may also make an unexpected change voluntarily and with sufficient capacity.
Capacity asks what the person could understand, appreciate, remember, and decide at the relevant time. Undue-influence analysis examines vulnerability, relationships, the decision environment, alleged influencing conduct, and the process by which the disputed decision developed.
See also: Undue Influence and Litigation Consultation and Expert-Witness Services
Relevant Experience
Dr. Blum is board-certified in psychiatry and fellowship-trained in forensic psychiatry and geriatric psychiatry. He has more than 30 years of specialized experience and has worked on more than 1,000 forensic matters in the United States and internationally. His publications include “Forensic Evaluations: Testamentary Capacity,” as well as work concerning mental capacity, undue influence, and geriatric forensic psychiatry.
His role is not to validate the retaining party’s preferred account. A disciplined opinion must address supporting evidence, contradictory evidence, reasonable alternative explanations, and uncertainty created by an incomplete record.
Attorney Case Inquiries
Attorneys may submit a brief, non-confidential inquiry for a preliminary conflict and case-fit review. Do not send records, privileged communications, protected information, or detailed case strategy before conflicts have been cleared and an engagement has been confirmed in writing.