Hare Psychopathy Checklist
The Hare Psychopathy Checklist-Revised (PCL-R) is the psychological assessment most commonly used to rate psychopathy. It is a 20-item inventory of perceived personality traits and recorded behaviors, intended to be completed on the basis of a semi-structured interview along with a review of 'collateral information' such as official records.
The PCL was originally developed in the 1970s by Canadian psychologist Robert D. Hare for use in psychology experiments, based partly on Hare's work with male offenders and forensic inmates in Vancouver, and partly on an influential clinical profile by American psychiatrist Hervey M. Cleckley first published in 1941. A revised version, renamed the Hare PCL, was drafted in 1985 and released in 1991 as the PCL-R, with an updated second edition in 2003. It comprises a manual, a rating booklet, scoring forms and interview guides.
An individual's score may have important consequences for his or her future, and because the potential for harm if the test is used or administered incorrectly is considerable, Hare argues that the test should only be considered valid if administered by a suitably qualified and experienced clinician under scientifically controlled and licensed, standardized conditions. Hare receives royalties on licensed use of the test. Hare is president of a consultancy group he named Darkstone Research Group Ltd, which provides training and accredits other centers to conduct training, which has been sponsored by Multi-Health Systems Inc. which sells the PCL-R.
In terms of psychometrics, the current version of the checklist has two factors (sets of related scores) that correlate about 0.5 with each other, with Factor One closer to Cleckley's original personality concept than Factor two. Hare's checklist does not incorporate the "positive adjustment features" that Cleckley did.
PCL-R model of psychopathy
The PCL-R is used for indicating a dimensional score, or a categorical diagnosis, of psychopathy for clinical, legal or research purposes. It is rated by a mental health professional (such as a psychologist or other professional trained in the field of mental health, psychology, or psychiatry), using 20 items. Each of the items in the PCL-R is scored on a three-point scale according to specific criteria through file information and a semi-structured interview. A value of 0 is assigned if the item does not apply, 1 if it applies somewhat, and 2 if it fully applies. In addition to lifestyle and criminal behavior the checklist assesses glib and superficial charm, grandiosity, need for stimulation, pathological lying, cunning and manipulating, lack of remorse, callousness, poor behavioral controls, impulsiveness, irresponsibility, denial, failure to accept responsibility for one's own actions and so forth. The scores are used to predict risk for criminal re-offense and probability of rehabilitation.
The current edition of the PCL-R officially lists three factors (1.a, 1.b, and 2.a), which summarize the 20 assessed areas via factor analysis. The previous edition of the PCL-R listed two factors. Factor 1 is labelled "selfish, callous and remorseless use of others". Factor 2 is labelled as "chronically unstable, antisocial and socially deviant lifestyle". There is a high risk of recidivism and mostly small likelihood of rehabilitation for those who are labelled as having "psychopathy" on the basis of the PCL-R ratings in the manual for the test, although treatment research is ongoing.
PCL-R Factors 1a and 1b are correlated with narcissistic personality disorder. They are associated with extraversion and positive affect. Factor 1, the so-called core personality traits of psychopathy, may even be beneficial for the psychopath (in terms of nondeviant social functioning).
PCL-R Factors 2a and 2b are particularly strongly correlated to antisocial personality disorder and borderline personality disorder and are associated with reactive anger, criminality, and impulsive violence. The target group for the PCL-R in prisons in some countries is criminals convicted of delict and/or felony. The quality of ratings may depend on how much background information is available and whether the person rated is honest and forthright.
The two factors
Traits not correlated with either factor
- Promiscuous sexual behavior
- Many short-term (marital) relationships
- Acquired behavioral sociopathy/sociological conditioning (Item 21: a newly identified trait i.e., a person relying on sociological strategies and tricks to deceive)
Early factor analysis of the PCL-R indicated it consisted of two factors. Factor 1 captures traits dealing with the interpersonal and affective deficits of psychopathy (e.g., shallow affect, superficial charm, manipulativeness, lack of empathy) whereas factor 2 dealt with symptoms relating to antisocial behavior (e.g., criminal versatility, impulsiveness, irresponsibility, poor behavior controls, juvenile delinquency).
The two factors have been found by those following this theory to display different correlates. Factor 1 has been correlated with narcissistic personality disorder, low anxiety, low empathy, low stress reaction and low suicide risk but high scores on scales of achievement and social potency. In addition, the use of item response theory analysis of female offender PCL-R scores indicates factor 1 items are more important in measuring and generalizing the construct of psychopathy in women than factor-2 items.
In contrast, factor 2 was found to be related to antisocial personality disorder, social deviance, sensation seeking, low socioeconomic status and high risk of suicide. The two factors are nonetheless highly correlated and there are strong indications they do result from a single underlying disorder. Research, however, has failed to replicate the two-factor model in female samples.
Recent statistical analysis using confirmatory factor analysis by Cooke and Michie indicated a three-factor structure, with those items from factor 2 strictly relating to antisocial behavior (criminal versatility, juvenile delinquency, revocation of conditional release, early behavioral problems and poor behavioral controls) removed from the final model. The remaining items are divided into three factors: arrogant and deceitful interpersonal style, deficient affective experience and impulsive and irresponsible behavioral style.
In the most recent edition of the PCL-R, Hare adds a fourth antisocial behavior factor, consisting of those factor-2 items excluded in the previous model. Again, these models are presumed to be hierarchical with a single, unified psychopathy disorder underlying the distinct but correlated factors.
The Cooke & Michie hierarchical three-factor model has severe statistical problems—i.e., it actually contains ten factors and results in impossible parameters (negative variances)—as well as conceptual problems. Hare and colleagues have published detailed critiques of the Cooke & Michie model. New evidence, across a range of samples and diverse measures, now supports a four-factor model of the psychopathy construct, which represents the interpersonal, affective, lifestyle, and overt antisocial features of the personality disorder.
The PCL-R is widely used to assess individuals in high secure psychiatric units, prisons and other settings. This may be help decide who should be detained or released, or who should undergo what kind of treatment. It is also used for its original purpose - to carry out basic psychology studies of psychopathy.
The PCL-R also has some wide use as a risk assessment tool that attempts to predict who will offend or reoffend. It has been touted as unparalleled in its ability in this regard, and there have been some positive studies, especially early on. However, several recent studies and very large-scale meta-analysis have cast serious doubt on whether it performs as well as other instruments, or better than chance, and to the extent that it does, whether this is largely due its inclusion of past offending history, rather than the personality trait scores that make it unique. In addition although in controlled research environments the Inter-rater reliability of the PCL-R may be satisfactory, in real-world settings it has been found to have rather poor agreement between different raters, especially on the personality trait scores. Further, a review which pooled together various risk assessment instruments including the PCL, found that peer-reviewed studies on which the developer or translator of the instrument was an author (which in no case was disclosed in the journal article) were twice as likely to report positive predictive findings.
On the purported basis of concerns about false positives, inadequately trained raters, and general misuse or overuse of the test including with different racial groups, an advice guide was published in 2011 on how to pass the Hare PCL-R.
Comparison with psychiatric diagnoses
Psychopathy, as measured on the PCL-R, is negatively correlated with all DSM-IV Axis I disorders except substance abuse disorders. Psychopathy is most strongly correlated with DSM-IV antisocial personality disorder.
The American Psychiatric Association's DSM-IV-TR indicates that psychopathy and sociopathy are other names for Antisocial Personality Disorder. In the DSM-V, however, psychopathy is also included in a separate speculative chapter for further research as a possible 'specifier' for ASPD - a particular type of ASPD characterized by a "bold interpersonal style". The World Health Organization in its ICD-10 refers to psychopathy, antisocial personality, asocial personality, and amoral personality as synonyms for dissocial personality disorder.
Among laypersons and professionals, there is much confusion about the meanings and differences between psychopathy, sociopathy, antisocial personality disorder, and the ICD-10 diagnosis, dissocial personality disorder. Hare takes the stance that psychopathy as a syndrome should be considered distinct from the DSM-IV's antisocial personality disorder construct, even though ASPD and psychopathy were intended to be equivalent in the DSM-IV. However, those who created the DSM-IV felt that there was too much room for subjectivity on the part of clinicians when identifying things like remorse and guilt; therefore, the DSM-IV panel decided to stick to observable behavior, namely socially deviant behaviors.
As a result, the diagnosis of ASPD is something that the "majority of criminals easily meet". Hare goes further to say that the percentage of incarcerated criminals that meet the requirements of ASPD is somewhere between 80 and 85 percent, whereas only about 20% of these criminals would qualify for a diagnosis of what Hare's scale considers to be a psychopath. This twenty percent, according to Hare, accounts for 50 percent of all the most serious crimes committed, including half of all serial and repeat rapists.
Hare wants the Diagnostic and Statistical Manual of Mental Disorders to list psychopathy as a unique disorder, saying psychopathy has no precise equivalent in either the DSM-IV-TR, where it is most strongly correlated with the diagnosis of antisocial personality disorder, or the ICD-10, which has a partly similar condition called dissocial personality disorder. Both organizations view the terms as synonymous. But only a minority of those in institutions whom Hare and his followers would diagnose as psychopaths are violent offenders.
Other psychopathy findings
According to Hare, one FBI study produced in 1992 found that 44 percent of offenders who killed a police officer were psychopaths. The study was 'Killed in the Line of Duty: A Study of Selected Felonious Killings of Law Enforcement Officers.'
There has been some controversy over the use of the PCL-R by UK prison and secure psychiatric services, including its role in the government's new administrative category of 'Dangerous and Severe Personality Disorder' (a separate older administrative category of 'psychopathic disorder' in the Mental Health Act was abolished in 2007). One leading forensic psychologist, while Deputy Chief at the Ministry of Justice, has argued that it has not lived up to claims that it could identify those who would not benefit from current treatments or those most likely to violently reoffend.
A study using the PCL-R to examine the relationship between antisocial behavior and suicide found that suicide history was strongly correlated to PCL-R factor 2 (reflecting antisocial deviance) and was not correlated to PCL-R factor 1 (reflecting affective functioning). Given that ASPD relates to factor 2, whereas psychopathy relates to both factors, this would confirm Hervey M. Cleckley's assertion that psychopaths are relatively immune to suicide. People with ASPD, on the other hand, have a relatively high suicide rate.
The PCL-R is sometimes used to assess risk of sexual (re)offending, with mixed results.
Since psychopaths frequently cause harm through their actions, it is assumed that they are not emotionally attached to the people they harm; however, according to the PCL-R checklist, psychopaths are also careless in the way they treat themselves. They frequently fail to alter their behavior in a way that would prevent them from enduring future discomfort.
In practice, mental health professionals rarely treat psychopathic personality disorders as they are considered untreatable and no interventions have proved to be effective. In England and Wales the diagnosis of dissocial personality disorder is grounds for detention in secure psychiatric hospitals under the Mental Health Act 1983 if they have committed serious crimes, but since such individuals are disruptive for other patients and not responsive to treatment this alternative to prison is not often used.
Because an individual's scores may have important consequences for his or her future, the potential for harm if the test is used or administered incorrectly is considerable. The test can only be considered valid if administered by a suitably qualified and experienced clinician under controlled conditions.
The manipulative skills of some psychopaths are valued for providing audacious leadership. It is argued psychopathy is adaptive in a highly competitive environment, because it gets results for both the individual and the corporations or, often small political sects they represent. However, these individuals will often cause long-term harm, both to their co-workers and the organization as a whole, due to their manipulative, deceitful, abusive, and fraudulent behaviour.
Hare has described psychopaths as 'social predators', 'remorseless predators', or in some cases 'lethal predators', and has stated that 'Psychopathic depredations affect people in all races, cultures, and ethnic groups, and at all levels of income and social status'.
- Diagnostic classification and rating scales used in psychiatry
- Actuarial tools in criminology
- Levenson Self-Report Psychopathy Scale
- Psychopathic Personality Inventory
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