list of traits advanced by Cleckley, with whom Hare corresponded over the years. Hare redrafted the checklist in 1985 following Cleckley's death in 1984, renaming it the Hare Psychopathy Checklist Revised (PCL-R). It was finalised as a first edition in 1991, when it was also made available to the criminal justice system, which Hare says he did despite concerns that it was not designed for use outside of controlled experimental research. It was updated with extra data in a 2nd edition in 2003. The PCL-R was reviewed in Buros Mental Measurements Yearbook (1995), as being the "state of the art" both clinically and in research use. In 2005, the Buros Mental Measurements Yearbook review listed the PCL-R as "a reliable and effective instrument for the measurement of psychopathy" and is considered the 'gold standard' for measurement of psychopathy. However, it is also criticised. Hare has accused the DSM's ASPD diagnosis of 'drifting' from clinical tradition, but his own checklist has been accused of in reality being closer to the concept of criminologists William and Joan McCord than that of Cleckley; Hare himself, while noting his promotion of Cleckley's work for four decades, has distanced himself somewhat from Cleckley's work. Hare is also co-author of derivatives of the PCL: the Psychopathy Checklist: Screening Version (PCL:SV) (still requires a clinical interview and review of records by a trained clinician), the P-Scan (P for psychopathy, a screening questionnaire for non-clinicians to detect possible psychopathy), the Psychopathy Checklist: Youth Version (PCL:YV) (to assess youth and children exhibiting early signs of psychopathy), and the Antisocial Process Screening Device (originally the Psychopathy Screening Device; a questionnaire for parents/staff to fill out on youth, or in a version developed by others, for youth to fill out as self-report). Hare is also a co-author of the Guidelines for a Psychopathy Treatment Program. He has also co-developed the 'B-Scan' questionnaires for people to rate psychopathy traits in others in the workplace. Hare was involved in a controversy in 2010 in which he threatened legal action if a peer-reviewed psychology article on the PCL was published that he claimed misrepresented his views. The paper eventually was published after a three-year delay. Impact The Hare Psychopathy Checklist-Revised is sometimes used as a standard instrument for researchers and clinicians, especially in forensic settings such as prisons or high secure psychiatric units. The measures play an important role in recent risk-for-violence instruments. The