Insanity Defense | Criminal Responsibility Evaluations in Chicago, Atlanta, and Fort Lauderdale

Insanity Defense Psychological Evaluations by Dr. Steven Gaskell

Psycholegal Assessments, Inc. specializes in conducting comprehensive insanity defense psychological evaluations to assess a defendant's mental state at the time of an alleged offense. Serving clients in Illinois, Georgia, Florida, Arizona, Kansas, and beyond, we offer both in-person and secure, online HIPAA-compliant video assessments.
Dr. Steven Gaskell is a holder of the PSYPACT Authority to Practice Interjurisdictional Telepsychology (APIT) which allows him to provide insanity defense psychological evaluations by telehealth across 43 States.

Furthermore, Dr. Gaskell possesses the Temporary Authorization to Practice (TAP) credential which allows him to provide temporary in-person insanity defense evaluation services in any of the 43 PSYPACT states.

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Contact us by email at drgaskell@gmail.com

Dr. Steven Gaskell - Forensic Psychologist

Dr. Steven Gaskell - Forensic Psychologist 

Insanity Defense

Insanity Defense

The insanity defense, also known as Not Guilty by Reason of Insanity (NGRI), is a legal doctrine asserting that a defendant was not criminally responsible for their actions due to a severe mental illness at the time of the offense. While this defense is raised in less than 1% of criminal cases, it underscores the importance of thorough psychological evaluations in the legal process. 


Acquittal rates vary from state to state, but on average the insanity defense is only successful in approximately 25% of those attempts. Over 90% of NGRI findings are stipulated by both sides without a trial. Insanity acquittees spend on average more time in a secure mental hospital than they would have spent incarcerated if they had been convicted.

Criminal Responsibility - Insanity Evaluations

When a defendant’s mental state at the time they committed an offense is at question, a criminal responsibility psychological evaluation or sanity evaluation may be requested by the court, defense, or prosecution. Although the criteria for an insanity plea depends on the legal jurisdiction in which the crime was committed (see insanity tests below), the basis of an insanity plea rests on the basic premise that the defendant was not criminally responsible for their actions at the time of the offense due to the influence of a mental illness. Utilizing relevant legal statutes and case law, Psycholegal Assessments, Inc. utilizes psychological testing and evaluation to address the criteria necessary for an insanity plea.


When asked for an opinion about Criminal Responsibility, Sanity at the Time of the Offense, or the Insanity Defense, Dr. Steven Gaskell first determines by examination and review of records whether a defendant’s mental or emotional state at the time of the alleged offense meets the threshold requirement for a major mental disease or defect.

Dr. Gaskell then renders an opinion as to whether that condition substantially impaired the defendant’s ability to appreciate the wrongfulness of the criminal act for which he or she is accused, or whether the defendant’s mental condition substantially impaired his or her capacity to conform their conduct to the requirements of the law, or both.


In reports and expert testimony, Dr. Gaskell presents detailed evidence that the defendant’s clinical mental state either does or does not satisfy the legal definition of insanity. He also uses psychological testing, when appropriate, to evaluate the defendant for the possibility of feigning or malingering. Psychological examination reports address the psychological data in terms of the legal criteria regarding Criminal Responsibility or Sanity at the Time of the Offense in the jurisdiction of the evaluation. Dr. Gaskell has completed more than 700 Criminal Responsibility evaluations and he has provided expert testimony regarding sanity at the time of the offense. Dr. Steven Gaskell is currently licensed as a psychologist in Illinois, Georgia, Florida, Arizona, and Kansas.

Tests for Insanity Image

Tests for Insanity

Courts in the United States use one of several established legal tests of insanity to determine whether someone was insane at the time of the offense. Insanity defense psychological evaluations utilize the appropriate test according to the jurisdiction. These tests for insanity are further described below.

Federal Standard Regarding the Insanity Defense

Federal Insanity Standard - United States Code - Title 18 - Part 1 - Chapter 1 - § 17

It is an affirmative defense to a prosecution under any Federal statute that, at the time of the commission of the acts constituting the offense, the defendant, as a result of a severe mental disease or defect, was unable to appreciate the nature and quality or the wrongfulness of his acts. Mental disease or defect does not otherwise constitute a defense. The defendant has the burden of proving the defense of insanity by clear and convincing evidence.

State Standards Regarding the Insanity Defense

Quick guide

Status of the Insanity Defense Among States

1. M’Naghten Rule (Standard Only)

Burden of proof on defendant unless noted

Burden on Defendant

  •  Alabama
  • Alaska (GBMI allowed)
  • Arizona
  • California
  • Delaware (GBMI allowed)
  • Indiana (GBMI allowed)
  • Iowa
  • Louisiana
  • Minnesota
  • Missouri
  • Nebraska
  • Nevada
  • New York (modified)
  • North Carolina
  • Pennsylvania (GBMI allowed)
  • South Carolina (GBMI allowed)
  • South Dakota (GBMI allowed)
  • Virginia (with irresistible impulse)
  • Washington

Burden on State


  • Florida
  • Mississippi
  • New Jersey
  • Oklahoma

2. M’Naghten Rule + Irresistible Impulse Test

Burden of proof on defendant unless noted

Burden on Defendant

  • Georgia (GBMI allowed)
  • Texas

Burden on State


  • Colorado
  • New Mexico (GBMI allowed)

3. ALI Model Penal Code Standard

Burden on Defendant

  • Arkansas
  • Connecticut
  • District of Columbia
  • Hawaii
  • Illinois (GBMI allowed)
  • Kentucky (GBMI allowed)
  • Maine
  • Maryland
  • Ohio
  • Oregon
  • Rhode Island
  • Vermont
  • Wisconsin
  • Wyoming

Burden on State


  • Massachusetts
  • Michigan (GBMI allowed)
  • North Dakota (modified)
  • Tennessee
  • West Virginia

4. Other / Unique Standards

Durham Standard

  • New Hampshire (burden on defendant)

5. States That Abolished the Insanity Defense

  • Idaho
  • Kansas
  • Montana (GBMI allowed)
  • Utah (GBMI allowed)

6. States Allowing “Guilty but Mentally Ill (GBMI)” Verdicts

(Across all rule types)

  • Alaska
  • Delaware
  • Georgia
  • Illinois
  • Indiana
  • Kentucky
  • Michigan
  • Montana
  • New Mexico
  • Pennsylvania
  • South Carolina
  • South Dakota
  • Utah

State Standards Regarding the Insanity Defense

Areas of Expertise

Competency to Stand TrialCompetency to Stand Trial

Competency to Stand Trial, also known as Fitness to Stand Trial, is imperative for ensuring that a defendant can comprehend the nature and objective of the legal actions against them and actively cooperate with their defense attorney.

Psychosexual EvaluationsPsychosexual Evaluations

Psychosexual evaluations of sex offenders incorporate a comprehensive risk assessment utilizing actuarial instruments and other research-supported risk and protective factors.

Criminal ResponsibilityCriminal Responsibility

Criminal responsibility or sanity evaluations are critical when a defendant’s mental state at the time of committing an offense is in question. These evaluations can be initiated by the court, defense, or prosecution to establish a clear understanding of the defendant’s mental condition during the crime.

Independent Medical ExamIndependent Medical Exam

An Independent Medical Exam is conducted by a psychologist without prior involvement in the individual’s care, ensuring an objective assessment without a therapist-patient relationship.

Miranda Rights & Confession IssuesMiranda Rights & Confession Issues

The role of confessions and self-incriminating statements in criminal cases cannot be understated. Confessions are produced in about 50% of criminal cases, where suspects who provide self-incriminating statements are 26% more likely to be found guilty and convicted (Leo, 2006).

Malingering and DeceptionMalingering and Deception

In the legal realm, psychological assessments can be compromised by malingering or deception, with individuals potentially presenting themselves dishonestly during interviews and tests to influence the outcome.

Mitigating FactorsMitigating Factors

Mitigating factors consider the defendant’s mental state and historical mental disorders or psychological trauma, even when these do not qualify for an insanity defense, to argue for a reduced sentence. The contributions of evaluations and reports by experts like Dr. Steven Gaskell are vital for presenting such evidence.

Guilty But Mentally Ill (GBMI)Guilty But Mentally Ill (GBMI)

Introduced first in Michigan in 1975, the GBMI verdict was proposed to diminish the success rate of insanity defenses, offering a compromise verdict that, while seemingly compassionate, subjects the defendant to the same penalties as a guilty verdict.

Video Conferencing Available!

Schedule your free video consultation today. HIPAA-compliant evaluations available across multiple states.

Video Conferencing Available!

Psychological evaluations are now able to be completed by HIPAA compliant video conferencing.

Request more details by filling out the form below.

Request Video Call

Video Conferencing Available!

Psychological evaluations are now able to be completed by HIPAA compliant video conferencing.

Request more details by filling out the form below.

Request Video Call
Expert Forensic Psychologist Dr. Steven Gaskell

Video Conferencing Available!

Psychological evaluations are now able to be completed by HIPAA compliant video conferencing.

Request more details by filling out the form below.

Request Video Call
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