This book offers a complete update of Monograph No. 6 focusing entirely on state and federal court expert evidence issues. The easy-to-read format provides quick access to the governing expert evidence rules in federal and state courts throughout the United States. The monograph consists of papers from each of the federal circuits. These papers analyze and summarize the key cases in each circuit and the state courts within the circuit. The book also includes in-depth commentary on the qualifications and increased scrutiny of experts, and the jurors' perception of expert testimony.