A popular screening tool for attention-deficit hyperactivity disorder (ADHD) may be less accurate when a child has an autism spectrum disorder (ASD), according to a new study published in the Journal of Autism and Developmental Disorders...The researchers, including one of the psychologists who developed the ADHD screening tool — the ADHD Rating Scale Fourth Edition (ADHD-RS-IV) — say that the scale needs to be refined to better identify the correct disorder and that it should also be supplemented with careful clinical interviews.