An adult psychiatric expert witness is a trained mental health professional who provides assessments and testimony in legal cases. They evaluate an individual's mental health to offer informed opinions on issues such as criminal responsibility, competency to stand trial, and the impact of mental illness on behaviour. The expert conducts evaluations, prepares reports, and may testify in court to help explain complex mental health matters in relation to the legal case. Their unbiased expertise is crucial in criminal, civil, family law, and disability claims. These professionals ensure that mental health considerations are accurately represented in legal proceedings, helping courts make informed decisions. Their testimony can be pivotal in determining outcomes that involve mental health issues.