Abstract
In the 20th century, the reliance on expert witnesses grew due to technological advancements and complex legal cases. Notably, the scientific foundation of psychology gained widespread acknowledgment, bestowing a pivotal role upon psychologists, particularly those specializing in forensic psychology, within the courtroom. In the United States, experts assist impartial judgments in the adversarial litigation model. This article conducts a comparative analysis of two casesone in South Korea and one in the United Stateswhere forensic psychologists played a central role in providing crucial assistance to defendants grappling with mental health issues. These cases shed light on the discernible distinctions within the expert witness systems between the two countries, emphasizing the profound impact of legal traditions on the significance attributed to expert opinions and the dynamics of equitable legal decision-making. This exploration underscores the evolving role of expert witnesses in an ever-advancing legal landscape, where their expertise continues to be a lodestar guiding the pursuit of justice.
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