This chapter explores the intricate connection between criminal behavior and psychopathy from a neuropsychological standpoint, providing insight into the behavioral expressions and neurological causes of this personality disorder. Readers are provided with an in-depth understanding of the cognitive, emotional, and interpersonal traits that characterize psychopathy, as well as the consequences of this diagnosis for legal decision-making, through a thorough examination of assessment methods and study findings. This chapter examines neuropsychological assessment methods, such as neuroimaging modalities and personality assessment tests, that are used to detect psychopathic tendencies. It also looks at the elements that raise the risk of bad things happening to a person with psychopathy, like violence and recidivism. Case studies demonstrate how neuropsychological insights can be used practically to assess the risk posed by people who exhibit psychopathic tendencies and to provide recommendations for punishment in court. The most important lessons learned are the difficulties and moral dilemmas that arise when trying to meet the requirements of this demographic, as well as the intricacies involved in diagnosing and treating psychopathy inside the criminal justice system.