Below is a checklist of what too many reports miss – and what you, as an attorney, should demand from any forensic psychologist you retain or challenge.

1. Identity organization – beyond the diagnosis

DSM‑5‑TR diagnoses tell you whether a person meets symptom criteria. They do not tell you how integrated or fragmented the person’s sense of self is. Two parents with identical BPD diagnoses can function radically differently – one may have a stable identity and be a capable, loving parent; the other may have severe identity diffusion, oscillating between overprotection and neglect, unable to maintain a coherent narrative of their own history.

Identity diffusion manifests as chronic emptiness, role confusion, contradictory self‑states, and difficulty committing to values or relationships. In custody cases, it often presents as inconsistency in parenting behavior (loving one week, rejecting the next), aligning with whichever partner validates them, or an inability to separate the child’s needs from their own emotional states.

What to look for in a report: Does the expert describe the parent’s level of identity functioning? Do they use dimensional models (AMPD level of personality functioning, PDM‑2) or merely list borderline criteria? If the report uses only categorical diagnosis, it is incomplete.

2. Defensive patterns – the engine of conflict

Defenses are automatic psychological processes that protect the individual from anxiety and emotional pain. Mature defenses (humor, sublimation, anticipation) are adaptive. Primitive defenses – especially splitting, projective identification, denial, and idealization/devaluation – are hallmarks of borderline personality organization and are directly relevant to legal decision‑making.

Splitting – seeing people as all‑good or all‑bad – drives parental alienation. The parent who splits sees the other parent as wholly evil and themselves as wholly good, making co‑parenting impossible. Projective identification – unconsciously inducing the other person to feel what the projector cannot tolerate – often fuels endless court filings and escalatory behavior. Denial of substance use or violent behavior, despite clear evidence, is another primitive defense that directly impacts risk assessment.

What to look for in a report: Does the expert identify the parent’s dominant defenses? Are primitive defenses described? Does the report explain how these defenses affect parenting capacity, cooperation, or risk? A report that ignores defenses misses the engine of conflict.

3. Mentalization capacity – the ability to see the child’s mind

Mentalization is the capacity to understand one’s own behavior and that of others in terms of intentional mental states – beliefs, desires, feelings, intentions. It is the foundation of empathy, perspective‑taking, and reflective functioning.

A parent with low mentalization capacity may interpret a child’s normal ambivalence (e.g., wanting to spend time with both parents) as proof of the other parent’s manipulation. They may be unable to grasp that the child has a separate mind with its own needs and feelings. Under stress, mentalization collapses, leading to rigid, concrete thinking, impulsive actions, and misattributions of intent.

In custody litigation, low mentalization is a strong predictor of poor co‑parenting, resistance to court orders, and inability to protect the child from adult conflict. Forensic evaluators should assess mentalization through structured interviews (e.g., Adult Attachment Interview, Reflective Functioning Scale) and through observations of how the parent talks about the child and the other parent.

What to look for in a report: Does the expert assess the parent’s capacity to mentalize? Is there any discussion of reflective functioning? Does the report describe how the parent understands the child’s perspective – or fails to?

4. Multi‑method evidence – the difference between opinion and science

A credible forensic evaluation is not a single 90‑minute interview. It is a multi‑method, data‑integrative process that includes:

• Comprehensive record review – medical, psychiatric, employment, educational, and legal records (often hundreds of pages).
• Multiple clinical interviews – typically 2‑4 sessions, sometimes more, to establish reliability and observe functioning over time.
• Psychological testing – when indicated, using instruments such as the PAI, MCMI, or R‑PAS, plus symptom validity tests to assess exaggeration or malingering.
• Collateral contacts – interviews with treaters, family members, or other relevant parties.

A report based on a single interview is not a forensic evaluation; it is a clinical impression, and it will not withstand cross‑examination. Attorneys should ask: Did the expert review all relevant records? How many interviews were conducted? Was any testing performed? Were collateral sources contacted?

What to look for in a report: The methodology section should be explicit. If it says only “clinical interview,” that is a red flag. A proper report will list each source of information and how it was used.

5. Reasoning and transparency – the chain from data to conclusion

Perhaps the most common failure in forensic reports is the absence of transparent reasoning. The report states a conclusion – “the parent lacks insight,” “the parent is a danger to the child” – without showing how the expert arrived at that opinion. This is not merely a stylistic flaw; it is a substantive one. Without a clear chain of reasoning, the opinion is essentially an assertion, not an expert opinion.

A well‑constructed report will:

• Present relevant data (interview statements, test scores, collateral observations).
• Interpret the data using established clinical and forensic standards.
• Address alternative explanations or contradictory evidence.
• Explain how the data support the specific conclusion.

What to look for in a report: Can you follow the logic from the evidence to the opinion? Does the expert acknowledge limitations or contrary information? If the report reads like a brief for one party, it is likely advocacy, not science.

Conclusion – what to demand from your expert

A structural forensic evaluation is not a luxury; it is the standard of practice for complex cases involving personality pathology, trauma, or high‑conflict dynamics. Attorneys should ask prospective experts:

• Do you use a multi‑method protocol (records, multiple interviews, testing, collateral)?
• Do you incorporate dimensional models (AMPD, PDM‑2) or only DSM‑5 criteria?
• Can you articulate how identity, defenses, and mentalization affect the specific legal question?
• Have you ever changed your opinion after reviewing contradictory data? (Intellectual honesty is a hallmark of a credible expert.)

If the expert cannot answer these questions, find another. If the opposing expert’s report fails this checklist, you have grounds for a Daubert challenge or a powerful cross‑examination.

Further reading:
• Why Personality Structure Matters in Custody Disputes
• Personality Structure, Forensic Evaluation, and the Limits of Symptom‑Based Diagnosis