The forensic evaluator enters the examination room expecting to meet parents who are somehow fundamentally different from the average. After all, a custody dispute implies conflict, and conflict implies problematic people — or at least one of them. Practice soon convinces them otherwise. They discover that a substantial proportion of these parents are individuals who are fully functional in other areas of life, often above average in competence and adaptation. They run businesses, care for patients, raise healthy children in cooperation with teachers and professionals. And yet they are capable of behavior that in another context would prompt a diagnostic conclusion with an unfavorable prognosis.
How can this be explained? And what does it imply for the interpretation of psychological assessment results?
The custody dispute as a specific ecological niche
In ecology, an organism cannot be meaningfully described without reference to the environment in which it functions. The same holds for human behavior. A custody dispute creates a specific psychological niche that consistently produces a particular kind of behavior — regardless of who enters it.
This niche is characterized by several key features that must be understood as mutually reinforcing factors.
Existential threat to the attachment bond. The parent finds themselves in a situation where the loss of daily contact with the child is a real possibility. This threat is processed by the nervous system as a threat to integrity — and leads to activation of stress axes, which under conditions of particularly uncontrollable and chronic stress temporarily reduce the efficiency of prefrontal circuits responsible for top-down regulation of attention, emotion, and planning. Behavioral control thus relies relatively more on reactive systems. This is not a metaphor but a well-documented neurobiological mechanism of threat response — with the degree of its expression varying among individuals depending on resilience, coping strategies, and other contextual factors.
Perception of a zero-sum game. Although current legal practice offers a full spectrum of arrangements — from various shared parenting models to individually tailored visitation schedules — many parents subjectively experience the situation as binary: win or lose, my child or theirs. This cognitive framing alone disadvantages cooperative strategies, which under such conditions are perceived as a risky weakening of one's own position. The perception of a zero-sum game thus increases the escalatory potential of interactions regardless of what the actual legal solutions might be.
Chronic stress of uncertain duration. Custody proceedings last months, sometimes years. This constitutes chronic stress with an uncertain end, not an acute traumatic episode. Such stress demonstrably impairs cognitive processing: it narrows attention, reduces capacity for perspective-taking, and strengthens confirmation bias. The parent gradually becomes unable to process the situation through any lens other than that of their own threatened position.
The adversarial logic of the proceedings. The legal system is primarily designed for adjudication of disputes and protection of rights, not for therapeutic intervention or psychological stabilization of the parties. Legal strategies inevitably rely on arguments in their client's favor — and this framework can inadvertently reinforce the image of an enemy at the expense of the ability to see the situation in its full complexity.
Regression in the service of ego defense
Psychoanalytic theory offers explanatory constructs for this dynamic that retain their descriptive value even outside their original context. It must be emphasized that these are hypothetical models for observed patterns of thinking and communication — not diagnostic labels. Their presence alone is not evidence of a personality disorder and must be assessed alongside developmental history, pervasiveness across different life contexts, and stability over time.
Splitting as a mode of thinking is rarely found in well-integrated adults. In the context of custody disputes, it appears with markedly higher frequency. The other parent ceases to be a complex human being with ambivalent qualities and becomes a flat character: an enemy, a manipulator, a danger. Paradoxically, this same parent was, until recently, a competent and loving co-parent. This inability to integrate positive and negative aspects of the same person need not be a sign of borderline personality organization — it can be a response to extreme stress activating developmentally older modes of processing threat.
Projection manifests as the attribution of one's own unacceptable affects — anger, jealousy, the desire to control the situation — to the other party. Identifying this mechanism is diagnostically valuable but requires caution: in the context of custody disputes, it occurs very frequently, and its presence alone says nothing about the severity of personality pathology.
Rationalization and moralization serve to present — and to subjectively experience — behavior motivated by fear or narcissistic injury as responsible parental protection. The insidiousness of this mechanism lies in the fact that the parent is not necessarily consciously untruthful. The declared motivation is experienced as authentic — while the primary impulse may stem from other, less acceptable drives.
Two dimensions of parental competence
Before turning to the question of interpreting diagnostic instruments, one key methodological point that is frequently overlooked must be named.
Parental competence is not a unidimensional construct. At minimum, two dimensions must be distinguished: competence in relation to the child and competence in relation to the other parent as a co-parenting partner. These dimensions can be markedly different in the same individual. A parent may be authentically caring, emotionally available, and stabilizing for the child — and yet repeatedly fail in the dimension of cooperation with the other parent, unable to separate the partner conflict from the parental role. This distinction is not merely academic: it has a direct impact on the formulation of forensic conclusions and recommendations. Stating that parental competence is generally impaired where the issue is a specific failure in the co-parenting dimension would be erroneous and potentially harmful.
Challenges in interpreting diagnostic instruments
Standardized diagnostic instruments — whether the MMPI-2, MMPI-2-RF, or performance-based methods — measure what they measure at a given moment. Their results are co-determined by the respondent's state at the time of the assessment. In a custody dispute, this means that profiles are, to varying degrees, shaped by the situational context rather than exclusively by enduring personality traits. This "state versus trait" problem is fundamental to the forensic context.
On scales measuring emotional distress, distrust, interpersonal sensitivity, or threat perception, elevations may appear that in a clinical setting would indicate pathology, but in a forensic context may accurately reflect the real experience of conflict and legal jeopardy. Among litigating parties, validity scales typically show a tendency toward defensive self-presentation — an effort to appear as favorably as possible in a situation where one is being evaluated. This tendency is an understandable strategy in the context of a parental competence assessment and cannot in itself be interpreted as evidence of deliberate deception. Interpretation should be anchored in norms and findings derived from forensic samples, not solely from general clinical norms.
This does not mean that the findings are non-diagnostic. It means that their interpretation requires systematic consideration of context. The forensic evaluator must be able to differentiate:
a) Stress reactions of situational origin, which subside after the conflict resolves and are not predictive of parental competence once the environment stabilizes.
b) Pre-existing personality traits that are amplified and instrumentalized by the conflict but existed beforehand — and may influence parental functioning even after the proceedings conclude.
c) Clinically significant personality disorders, for which the custody dispute is merely one of many arenas where characteristic patterns manifest pervasively across contexts — patterns that cannot be explained by situational stress.
These three categories are diagnostically entirely distinct, yet their surface manifestations can be very similar in a single-session assessment.
The dynamics of mutual escalation
Parental behavior cannot be fully understood without analyzing the parents' mutual interaction. This is a systemic dynamic, not a sum of two individual psychopathologies.
Custody disputes typically unfold according to a logic of mutual escalation, where each parent's behavior provokes and legitimizes the behavior of the other. Parent A restricts the child's contact with Parent B. Parent B responds with a legal filing and public accusations. Parent A feels their concerns confirmed and escalates their defense. A cycle of pathological interaction ensues. Six months later, both parents are convinced they are victims of aggression — and both have real evidence for this conviction, because both reactively escalated at some point.
For the forensic evaluator, this has a critical methodological consequence: assessing one parent without considering the behavior of the other and the overall interactional dynamic is always incomplete. Conclusions drawn in isolation from a single assessment are potentially misleading.
What does this tell us about parental competence?
The question that primarily concerns the forensic evaluator in custody cases is not "What psychopathology does this parent have?" but rather "What are their parental competencies, and how will the outcome of these proceedings affect them?"
A well-adapted parent who temporarily behaves less adaptively under extreme stress does not automatically lose parental competence. The capacity for empathic care, consistent boundary-setting, and emotional availability may be situationally diminished without being structurally compromised. After the acute conflict subsides, these capacities recover in many parents. Situational reactivity, which may be functional in the short term as an adaptation to perceived threat, is typically destructive in the long term — for the child, for co-parenting cooperation, and ultimately for the parent themselves.
The clinically relevant question is therefore not merely how the parent is behaving now — but how they functioned before the conflict, how they present in other relationships and roles, and what their prognosis is once the situation stabilizes. This perspective requires a thorough history, contextual interviews, and — where possible — collateral information from settings outside the legal proceedings.
The differential diagnosis between situational reactivity and structural personality pathology is the central task of the forensic evaluator: while situational reactions subside after the dispute ends and parental capacity recovers, structural pathology persists and generates conflicts in other areas of life as well. Confusing these two categories leads to erroneous conclusions with serious consequences for all involved.
The forensic evaluator as an interpreter of context
A psychological assessment in a custody case is always an assessment of a person in an extreme situation. The results it produces are co-determined by this situation — and interpreting them without systematically accounting for it would be methodologically flawed.
What is externally described as the decline of a good parent into an enemy is, from a professional perspective, better understood as the product of systemic incentives, chronic stress, and uncertainty that increase the probability of behavior which, under different conditions, this parent would themselves reject. Neurobiology, meanwhile, does nothing to make the situation easier.
The task of the forensic evaluator is not to note the decline. It is to distinguish what is situational from what is structural, what is reactive adaptation from what is character, what is context-driven distress from what is pervasive pathology. This distinction is difficult. But it is precisely the part of the work
