A rater-based instrument for the assessment of psychopathy in adults that is considered by some to be the "gold standard" and has been adopted worldwide as the most reliable and valid measure is the:

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The Hare Psychopathy Checklist-Revised (PCL-R) is considered by many to be the "gold standard" for the assessment of psychopathy in adults. It has been extensively researched and validated, and is widely used and recognized by professionals in the field. It is a rater-based instrument that assesses interpersonal and affective traits, as well as behavioral and lifestyle factors associated with psychopathy. It has been adopted worldwide as the most reliable and valid measure of psychopathy.

A Rater-Based Instrument for the Assessment of Psychopathy in Adults