A new study published in Jama Network Open has raised concerns about the reliability of diagnostic interviews used for assessing mental health disorders such as depression, anxiety, and substance use disorders. Conducted by Laura Duncan, a psychiatry professor at McMaster University, the research indicates that while these interviews are often regarded as the 'gold standard' for diagnosis, they do not consistently provide reliable results. The study analyzed data from February 2024 to September 2025, using Cohen’s kappa coefficient to assess the test-retest reliability of various diagnostic interviews. Results showed that reliability was generally higher for substance use disorders, particularly opioid use disorder, due to the behavioral nature of the criteria. Critics, including Dr. Michael First, expressed frustration over the lack of detailed comparisons of specific diagnostic tools and the study's approach of grouping structured and semi-structured interviews together. The findings highlight the urgent need for more rigorous research into psychiatric diagnostic methods and suggest a potential shift towards viewing mental health conditions as existing on a continuum rather than as binary categories.