Aberrant type 2 dopamine receptor availability in violent offenders with psychopathy.

Psychopathy is characterized by antisocial behavior, poor behavioral control and lacking empathy, and structural alterations in the corresponding neural circuits. Molecular brain basis of psychopathy remains poorly characterized. Here we studied type 2 dopamine receptor (D2R) and mu-opioid receptor (MOR) availability in convicted violent offenders with high psychopathic traits (n = 11) and healthy matched controls (n = 17) using positron emission tomography (PET). D2R were measured with radioligand [11C]raclopride and MORs with radioligand [11C]carfentanil. Psychopathic subjects had lowered D2R availability in caudate and putamen, and striatal D2R availability was also associated with degree of psychopathic traits in this prisoner sample. No group differences were found in MOR availability, although in the prisoner sample, psychopathic traits were negatively correlated with MOR availability in the amygdala and nucleus accumbens. We conclude that D2R signaling could be the putative neuromolecular pathway for psychopathy, whereas evidence for alterations in the MOR system is more limited.

Perception of emotional facial expressions in aggression and psychopathy.

BACKGROUND: Altered affective state recognition is assumed to be a root cause of aggressive behavior, a hallmark of psychopathologies such as psychopathy and antisocial personality disorder. However, the two most influential models make markedly different predictions regarding the underlying mechanism. According to the integrated emotion system theory (IES), aggression reflects impaired processing of social distress cues such as fearful faces. In contrast, the hostile attribution bias (HAB) model explains aggression with a bias to interpret ambiguous expressions as angry. METHODS: In a set of four experiments, we measured processing of fearful and angry facial expressions (compared to neutral and other expressions) in a sample of 65 male imprisoned violent offenders rated using the Hare Psychopathy Checklist-Revised (PCL-R, Hare, R. D. (1991). The psychopathy checklist-revised. Toronto, ON: Multi-Health Systems) and in 60 age-matched control participants. RESULTS: There was no evidence for a fear deficit in violent offenders or for an association of psychopathy or aggression with impaired processing of fearful faces. Similarly, there was no evidence for a perceptual bias for angry faces linked to psychopathy or aggression. However, using highly ambiguous stimuli and requiring explicit labeling of emotions, violent offenders showed a categorization bias for anger and this anger bias correlated with self-reported trait aggression (but not with psychopathy). CONCLUSIONS: These results add to a growing literature casting doubt on the notion that fear processing is impaired in aggressive individuals and in psychopathy and provide support for the idea that aggression is related to a hostile attribution bias that emerges from later cognitive, post-perceptual processing stages.

Hypothalamic subunit volumes and relations to violence and psychopathy in male offenders with or without a psychotic disorder.

The hypothalamus is key to body homeostasis, including regulating cortisol, testosterone, vasopressin, and oxytocin hormones, modulating aggressive behavior. Animal studies have linked the morphology and function of the hypothalamus to aggression and affiliation, with a subregional pattern reflecting the functional division between the hypothalamic nuclei. We explored the relationship between hypothalamic subunit volumes in violent offenders with (PSY-V) and without (NPV) a psychotic disorder, and the association with psychopathy traits. 3T MRI scans (n = 628, all male 18-70 years) were obtained from PSY-V, n = 38, NPV, n = 20, non-violent psychosis patients (PSY-NV), n = 134, and healthy controls (HC), n = 436. The total hypothalamus volume and its eleven nuclei were delineated into five subunits using Freesurfer v7.3. Psychopathy traits were assessed with Psychopathy Checklist-revised (PCL-R). ANCOVAs and linear regressions were used to analyze associations with subunit volumes. Both groups with a history of violence exhibited smaller anterior-superior subunit volumes than HC (NPV Cohen's d = 0.56, p = 0.01 and PSY-V d = 0.38, p = 0.01). There were no significant differences between HC and PSY-NV. PCL-R scores were positively associated with the inferior tubular subunit on a trend level (uncorrected p = 0.045, Cohen's d = 0.04). We found distinct hypothalamic subunit volume reductions in persons with a history of violence independent of concomitant psychotic disorder but not in persons with psychosis alone. The results provide further information about the involvement of the hypothalamus in aggression, which ultimately may lead to the development of targeted treatment for the clinical and societal challenge of aggression and violent behavior.

Cortical and subcortical grey matter correlates of psychopathic traits in a Japanese community sample of young adults: sex and configurations of factors' level matter!

While neuroimaging research has examined the structural brain correlates of psychopathy predominantly in clinical/forensic male samples from western countries, much less is known about those correlates in non-western community samples. Here, structural magnetic resonance imaging data were analyzed using voxel- and surface-based morphometry to investigate the neuroanatomical correlates of psychopathic traits in a mixed-sex sample of 97 well-functioning Japanese adults (45 males, 21-39 years; M = 27, SD = 5.3). Psychopathic traits were assessed using the Self-Report Psychopathy Scale (SRP-SF; 4th Edition). Multiple regression analysis showed greater Factor 1 scores were associated with higher gyrification in the lingual gyrus, and gray matter volume in the anterior cingulate cortex and amygdala/hippocampus border. Total psychopathy and Factor 1 scores interacted with sex to, respectively, predict cortical thickness in the precuneus and gyrification in the superior temporal gyrus. Finally, Factor 1 and Factor 2 traits interacted to predict gyrification in the posterior cingulate cortex. These preliminary data suggest that, while there may be commonalities in the loci of structural brain correlates of psychopathic traits in clinical/forensic and community samples, the nature of that association might be different (i.e. positive) and may vary according to sex and configurations of factors' level.

Validating the Revised Mating Effort Questionnaire.

The mating effort questionnaire (MEQ) is a multi-dimensional self-report instrument that captures factors reflecting individual effort in upgrading from a current partner, investment in a current partner, and mate seeking when not romantically paired. In the current studies, we sought to revise the MEQ so that it distinguishes among two facets of mate seeking-mate locating and mate attracting-to enable a more nuanced measurement and understanding of individual mating effort. Moreover, we developed additional items to better measure partner investment. In total, the number of items was increased from 12 to 26. In Study 1, exploratory factor analysis revealed that a four-factor solution, reflecting partner upgrading, mate locating, mate attracting, and partner investment, yielded the best fit. In Study 2, this structure was replicated using confirmatory factor analysis in an independent sample. Based on extant studies documenting the relationships between psychopathy, short-term mating effort, and sexual risk taking, a structural equation model (SEM) indicated that trait psychopathy positively predicted mate locating, mate attracting, and partner upgrading and negatively predicted partner investment. A separate SEM showed that partner upgrading positively predicted risky sexual behaviors, while partner upgrading and mate locating positively predicted acceptance of cosmetic surgery.

Validation of the Levenson Self-Report Psychopathy (LSRP) scale in the non-institutionalized Lebanese population.

BACKGROUND: Psychopathy has been described as "the first personality disorder to be recognized in psychiatry". It has three core features: affective, interpersonal, and behavioral. The Levenson Self-Report Psychopathy (LSRP) scale is used to screen for and measure psychopathy. Our study aims to validate the LSRP as a tool to measure psychopathy in the non-institutionalized Lebanese population. METHODS: We surveyed Lebanese individuals residing in Lebanon and aged 18 through 65. It was a convenience sample collected via an online survey. 534 Lebanese participants completed the survey and were included in our analyses. Nearly 80% were female, 90% were college educated, and 60% were employed. We used exploratory graph analysis and confirmatory factor analyses to measure internal validity of the LSRP. We also used the HEXACO Personality Inventory-Revised (HEXACO-PI-R), the Subtypes of Antisocial Behavior Questionnaire (STAB), and the Short version of the Urgency, Premeditation (lack of), Perseverance (lack of), Sensation Seeking, Positive Urgency, Impulsive Behavior Scale (S-UPPS-P) to measure external validity of LSRP. RESULTS: The exploratory graph analysis showed that the LSRP had a three-factor structure (Egocentric, Callous and Antisocial) in the Lebanese population. This three-factor structure (RMSEA = 0.05, CFI = 0.83, SRMR = 0.06) yielded a better fit than the two-factor, and three-factor Brinkley models. The LSRP was negatively correlated with the Honesty-Humility dimension of the HEXACO-PI-R and positively correlated with the STAB and S-UPPS-P subscales. CONCLUSIONS: The LSRP scale is a valid measure of psychopathy in the Lebanese non-institutionalized population, adding to the currently limited literature addressing psychopathy in the Arab World.

Adverse childhood events and self-harming behaviours among individuals in Ontario forensic system: the mediating role of psychopathy.

BACKGROUND: Adverse childhood events (ACEs), psychopathy, and self-harming behaviours are prevalent among individuals in the forensic psychiatry system. While existing literature suggests that ACEs, self-harm, and psychopathy are interrelated, little is known about the interplay of psychopathic traits in this relationship. The present study aimed to determine the mediating role of psychopathy in the relationship between ACEs and self-harming behaviours in forensic patients. METHODS: This was a retrospective study of patients under the Ontario Review Board (ORB) between 2014 and 2015. In the analysis, we included patients with complete data on ACEs, self-harming behaviours, and a Psychopathy Checklist-Revised (PCL-R) score - a measure of psychopathic traits and their severity conducted during the reporting period. Mediation analysis was based on the Baron and Kenny approach, and sensitivity analysis was performed based on the types of ACEs. RESULTS: ​​​The sample population (n = 593) was made up of adults, with a mean age of 41.21 (± 12.35) years and were predominantly males (92.37%). While there was a partial mediating effect of psychopathy on the relationship between ACEs and incidents of self-harming behaviours in the past year, the mediation was complete in the relationship between ACEs and a lifetime history of self-harming behaviours. Following sensitivity analysis based on the types of ACE, the mediating effects were more attributed to specific ACEs, especially having experienced child abuse or having an incarcerated household member before 18 years. CONCLUSION: Among forensic patients in Ontario, psychopathy mediates​ ​the relationship between experiencing ACEs and engaging in self-harming behaviours. Effective intervention to mitigate self-harming behaviours in this population should consider the potential role of psychopathy, especially among individuals who have experienced ACEs involving a history of child abuse and a family who was incarcerated.

The joy of being frightened: Fear experience in psychopathy.

OBJECTIVE: Psychopathic traits are associated with abnormalities in fear processing. While traditional theories focus on a lack of fear, Hosker-Field et al. (2016) provided a new perspective. They suggested that individuals with elevated psychopathic traits may experience threatening situations with appreciation or positivity, resulting in reduced negative fear responses and heightened positive responses (fear enjoyment hypothesis, FEH). METHOD: Our study aimed to refine Hosker-Field et al.'s (2016) study design, addressing methodological limitations and improving the inconsistent operationalization of fear experience in the literature. In an online sample of 353 participants from the general population, we examined the relationship between the FEH and relevant psychopathic traits, specifically those derived from the PCL-R framework (i.e., SRP 4 Factor 1), and from a more trait-based approach to psychopathy with assumed links to fearlessness (i.e., TriPM Boldness). RESULTS: By employing linear mixed effect models, we extended Hosker-Field et al.'s correlational analysis and provided further evidence for the FEH, particularly in relation to psychopathic traits measured using the PCL-R framework. The results regarding Boldness, however, are somewhat inconclusive. CONCLUSION: The present study enhances existing research on fear deficits in psychopathy by assessing the subjective experience of individuals facing threat.

Marital quality improves self- and partner-reported psychopathy among Chinese couples: A longitudinal study.

BACKGROUND: Psychopathy is closely related to many negative interpersonal outcomes in daily life, including violence. Therefore, psychopathy intervention in subclinical individuals has significant application value. OBJECTIVE: Guided by the personality-relationship transaction model and social investment theory, this study examined how marital quality affects self- and partner-rated psychopathy. We also used the actor-partner interdependence mediation model to explore the mediating effect of communication. METHODS: We examined self-reports and partner reports of psychopathy, marital quality, and communication among 260 married Chinese couples. RESULTS: The results indicated that marital quality directly influenced couples' self-rated psychopathy, with both actor and partner effects on husbands' psychopathy and actor effects on wives' psychopathy. Moreover, verbal communication had mediating effects at time 2 between marital quality at time 1 and partner-reported psychopathy at time 3. Meanwhile, the mediating effect of nonverbal communication was not significant. CONCLUSION: Our investigation of relationship effects on psychopathy revealed that the underlying mechanisms differed between self- and partner-rated psychopathy. The findings can highlight directions for exploring potential intervention strategies for subclinical psychopathy.

Will the Dark Triad Engender Psychopathological Symptoms or Vice Versa? A Three-Wave Random Intercept Cross-Lagged Panel Analysis.

INTRODUCTION: The Dark Triad (DT), including narcissism, Machiavellianism, and psychopathy, represents the dark side of human nature and has been related to psychopathological symptoms (e.g., depression, anxiety, and stress). However, little is known about how the two constructs are related longitudinally. To fill this gap and to clarify the directionality between them, we conducted a longitudinal study. METHODS: We measured DT traits and psychopathological symptoms in a large sample of university students (NT1 = 1815) annually for 3 years. We implemented random intercept cross-lagged panel models in analysis. RESULTS: Narcissism and psychopathological symptoms showed a reciprocal relationship at the within-person level: greater narcissism preceded a decline in psychopathological symptoms, while more severe symptoms preceded a decrease in narcissism. Within the same individual, increases in the DT, particularly psychopathy and Machiavellianism, were linked to concurrent escalations in the symptoms. Additionally, all DT traits were positively correlated with psychopathological symptoms as stable differences between individuals. CONCLUSIONS: This study constitutes an important step in clarifying the directionality between the DT and psychopathological symptoms, and advances our understanding of the interplay between these two constructs at both the between-person and within-person levels.

Effects of psychopathic traits on preferential recall and recognition of emotionally evocative photos.

Psychopathic traits are associated with impaired emotional processing. The present study examines the potential association between psychopathic traits and memory for emotional stimuli. Although a significant body of research suggests that memory is heightened for emotional stimuli, it is unclear how psychopathic traits may disrupt this process. Eighty-two male jail inmates completed an emotional memory task as well as portions of a standardised memory assessment. Psychopathic traits were not associated with the ability to freely recall images of positive, negative or neutral valence that participants had seen more than 15 min prior; psychopathic traits were also not associated with the ability to recognise these previously viewed images when shown them again. Exploratory analyses indicated trends toward reduced accuracy in recognising both positive and negative, but not neutral, emotional stimuli in individuals with higher levels of interpersonal and affective traits of psychopathy. As expected, psychopathy was unrelated to non-emotion-related memory functioning in auditory and visual domains as measured by the Wechsler Memory Scales 4th Edition. Overall, these results do not support the hypothesis that psychopathic traits significantly interfere with memory for emotional stimuli.

Gender differences and the association between the phenomenological characteristics of autobiographical memories and psychopathic traits in a university student sample.

The study aimed to analyse the relationship between the dimensions of the triarchic model of psychopathy (meanness, boldness and disinhibition) and the phenomenological characteristics of Autobiographical Memory (AM) in a sample of university students, examining potential gender differences. Participants (N = 260; 55.4% women; aged 18-25) performed an AM task, followed by the Autobiographical Memory Characteristics Questionnaire and the Triarchic Psychopathy Measure. We found gender differences, with men scoring higher than women in meanness and disinhibition as well as in precision, accessibility, sharing and narrative coherence of AM. Correlations showed that boldness was negatively related to the valence and emotional intensity of the memory. Meanness was positively associated with precision, sensory details, accessibility, sharing, narrative coherence, distancing and preoccupation with emotions and negatively with recollection. Disinhibition was positively related to precision, sensory details and accessibility and negatively to intensity, distancing and preoccupation with emotions. Our results suggest that psychopathic traits could predict certain characteristics of AM, highlighting the predictive value of meanness, especially regarding memory quality characteristics (e.g., precision), as well as disinhibition, concerning the emotional content (e.g., preoccupation with emotions). Our results contribute to understanding psychopathy through an autobiographical perspective, showing how psychopathic traits may shape how people remember personal events.

Resting heart rate moderates the relationship between parental emotion socialization and callous-unemotional traits in children.

Although empirical findings have indicated that both familial and neurobiological risk factors contribute to the development of callous-unemotional (CU) traits in children, relatively few studies have investigated how these two factors interact to influence these traits. The current study focused on the combined effects of parental emotion socialization and child's resting heart rate on CU traits. Parents of Chinese children (N = 166) completed the Coping with Children's Negative Scale when children were 9.39 years old (SD = 0.92), while children's resting heart rate data were collected when they were 10.21 years old (SD = 0.72). When they were 11.15 years old (SD = 0.67), parents completed the Inventory of Callous-Unemotional Traits Short-Form. Results showed that parental supportive emotion socialization was negatively associated with CU traits and Callous behaviors in particular. In addition, resting heart rate moderated the relationship between parental emotion socialization and child's CU traits. Findings provide further evidence that an interdisciplinary approach that combines both psychosocial and biological factors is essential to further our understanding of CU traits in youth.

Therapeutic and risk relevance of psychopathy and general criminal attitude change in an institutional sexual offense treatment program.

We examined the interrelationships between psychopathy, changes in general criminal attitudes, and community recidivism in a sample of 212 men who attended an institutional sexual offense treatment program (SOTP) and were followed for an average of 12.73 years post-release. The men completed a self-report measure of general criminal attitudes, the Criminal Sentiments Scale, as part of routine SOTP service delivery, Psychopathy Checklist-Revised (PCL-R) ratings were completed via file review, and recidivism data were obtained from official criminal records. Criminal attitude endorsement and criminal attitude change had clinically meaningful, but differential, associations with the antisocial and interpersonal features of psychopathy. Further, positive changes in criminal attitudes-particularly tolerance of law violations (i.e., rationalizations for criminal behavior)-were significantly predictive of reductions in community violent and general recidivism after controlling for PCL-R score. Results demonstrate that general criminal attitude change has risk relevance in the treatment of high psychopathy persons with sexual offense histories.

Capital sentencing and neuropsychiatry.

The neuropsychiatric contribution to capital sentencing proceedings has grown substantially in recent decades as the consideration of neurological and psychiatric factors in criminal behavior has been increasingly accepted as relevant to the quest for justice. This review article will focus on the legal theories underlying neuropsychiatric input into capital sentencing decisions, as well as some of the investigative techniques and resulting data which may be offered by forensic neuropsychiatrists in this context. The death penalty is unique in its severity and irreversibility, as the courts, including the U.S. Supreme Court, have noted repeatedly. "Death is different," and the recognition of this has generated a set of court decisions and statutes pertinent specifically to capital proceedings, both procedural and substantive.

The Risk, Need, and Responsivity Relevance of Working Alliance in a Sexual Offense Treatment Program: Its Intersection With Psychopathy, Diversity, and Treatment Change.

The current study examined the self-reported working alliance of men attending a high intensity sexual offense treatment program and its associations with psychopathy, sexual violence risk, treatment change, and recidivism, in a Canadian sample of 317 incarcerated men followed up an average of approximately 10 years post release. Working Alliance Inventory (WAI; Horvath & Greenberg, 1989) self-reported total, Task, Bond, and Goal scores were positively correlated with treatment related changes in risk, and inversely associated with Psychopathy Checklist-Revised (PCL-R; Hare, 1991; Wang & Hare, 2003) scores. The Affective facet of the PCL-R, representing the callous-unemotional features of the syndrome, uniquely predicted lower Bond and Goal scores controlling for the other facets. Cox regression survival analyses demonstrated that sexual violence risk predicted increased sexual recidivism while change predicted decreased sexual recidivism controlling for PCL-R total score; however, WAI scores (particularly the Goal component) were also unexpectedly associated with increased sexual recidivism. For violent recidivism, psychopathy, risk, and change incremented the prediction of general violence, while the WAI was not significantly associated with this outcome. A set of parallel analyses, stratified by Indigenous ethnocultural heritage, demonstrated some continuity, but also potential areas of difference, in substantive findings. Risk, need, responsivity implications of the working alliance for the treatment of high psychopathy correctional clientele, and how this may intersect with Indigenous heritage, are discussed.

The Propensity for Deviant Sexual Behavior in the General Population: An Empirical Examination of the Motivation-Facilitation Model.

In their influential paper Wurtele et al. (2014) investigated the degree to which individuals within the general population (N = 435) express sexual interest in children. In the male population of their study (n = 173), about 6% showed a propensity to engage in sexual activity with a child. Based on a German general population sample consisting of women and men (N = 911, n = 206 males), we were able to replicate most of the results of Wurtele and colleagues (e.g., 6% of men indicated some likelihood of having sex with a child). To explain sexual offending, Seto (2019) developed the motivation-facilitation model (MFM). In our study, we were interested whether this model also translates to explaining the propensity for deviant sexual behavior in the general population. Moderated hierarchical logistic regression analyses revealed that hypersexuality and sexual fantasies had significant effects as motivating factors for deviant sexual behavior (e.g., sexually assaulting an adult), whereas we found no significant effect of psychopathy as a facilitator. For the prediction of child sexual abuse, only hypersexuality had a significant effect. Notably, after including gender in both models the effect of hypersexuality was no longer significant. Accordingly, we were able to show that the MFM is useful in explaining the propensity for deviant sexual behavior foremost in the male general population. Thus, in clinical practice an assessment of hypersexuality seems to be most relevant for the male population.

Understanding Social Judgments of and Proclivities to Commit Upskirting.

Against a backdrop of legislative change that sees the taking of private sexual images underneath the clothing of a non-consenting other being made a criminal offence - upskirting - there is a need to understand the public's judgments of and motivations to perpetrate said behavior. In this study (N = 490), we investigated whether judgments of upskirting differed as a function of the sex of the person who was upskirted (male, female) and their perceived attractiveness (attractive, unattractive), as well as how variation in voyeuristic interest, belief in a just world, and dark personality traits predicted judgments of and proclivity to engage in upskirting. We consistently observed more lenient judgments of upskirting behavior when the person who was upskirted was attractive and male, with such judgements predicted by older age across all conditions. Moreover, proclivity to engage in upskirting was predicted by past voyeuristic behaviors, higher psychopathic personality, and being male and of older age. We discuss our findings in the context of needing to qualitatively understand the rationale underpinning these judgments, combating barriers to disclose victimization, and practitioner implications.

Psychopathy, criminogenic cognitions and emotional responses to affective stimuli among male adult offenders.

BACKGROUND: Previous research has consistently shown value in studying emotion processing with psychopathy, but the relative effect of aural and visual stimulation has hardly been considered. AIMS: Our aims were to (1) compare reaction time and self-rated valence ((un)pleasantness), arousal and sense of being dominated by affective sounds or visual images among offenders with and without psychopathy (=/>26) on the psychopathy check-list revised; (2) investigate any associations, controlling for social desirability and depression; (3) explore the possible mediating effect of criminogenic cognitions on any relationships between psychopathy and emotional responses to affective stimuli. METHODS: Professional educators invited all male offenders serving semi-open custody sentences in one prison to participate. After a semi structured interview to assess psychopathy, they self-reported on criminogenic cognition, depression and social desirability scales, before a computer task using standardised human and animal sounds and images. Using the self-assessment manikin, participants rated the emotional valence, arousal and dominance levels when pleasant, unpleasant and neutral sounds or images were presented. RESULTS: About one in three prisoners completed all the ratings-120 men, of mean age 38.8 years (SD = 11.06). All had shorter reaction times to sounds than images. Offenders with high affective-interpersonal factor scores rated all types of sounds as less pleasant. Men with high psychopathy scores took longer to respond to unpleasant images than those with lower scores. There was a positive relationship between psychopathy factors and criminogenic cognitions and the external locus of criminogenic cognitions mediated the relationship between psychopathy facets and emotional responses of valence to pleasant sounds. CONCLUSION: Our findings confirm the potential importance of emotional reactions to sounds as well as images among men with psychopathy. Given the shorter reaction times to sounds, in real life sounds could prove more provocative than images. While only small differences emerged between men above and below the PCL-R threshold, indications from facet analyses suggest that further study of sound stimuli could enhance the understanding of emotional response differences to inform interventions. Future research in this area should focus on human-related stimuli and add alexithymia measures.

Psychopathy traits explain variance shared between features of substance use disorders and violence.

BACKGROUND: There is a substantial research literature on identifying risk and protective factors for violence perpetration. Substance use disorders have long been identified as constituting a significant predictor of violent behaviour. Psychopathy traits have also been similarly recognised, but inter-relationships between psychopathy traits, features of substance use disorders and violence have been little explored. AIMS: To determine the degree to which shared variance between substance dependence symptoms and violence, as indicated by criminal charges for violent offences, among jailed men can be explained by psychopathy traits. METHODS: Features of dependence on substances in three drug classes (alcohol, cannabis and cocaine) were assessed in a sample of 682 men in a county jail awaiting trial on criminal charges, many for violent offences. Statistical comparisons of zero-order and partial correlations tested whether accounting for psychopathy total and facet scores, assessed by the Psychopathy Checklist-Revised (PCL-R), affected associations between substance dependence symptoms and violent charges. RESULTS: Total PCL-R scores accounted for a significant proportion of the shared variance between the history of criminal charges for violence offences and lifetime substance dependence symptoms in all three drug classes. At the facet level, controlling for ratings on the interpersonal and modified antisocial facets reduced the association between criminal charges for violent offences and symptoms of cocaine dependence; controlling for ratings on a modified antisocial facet also attenuated links between alcohol and cannabis dependence symptoms and history of charges for violent offences. CONCLUSION: These findings build on the sparse literature to date on the role of psychopathy traits on relationships between features of substance use disorders and violence. Given that the observed connection between substance dependence symptoms and charges for violent offences is partly accounted for by individual differences in psychopathy traits, it follows that effective treatment for those traits may be useful, perhaps essential to reducing links between features of some substance use disorders and violent offending.