Warning that he asks a lot of questions without answering most of them, Barnett, a criminalist in private practice in California, reviews the history of ethical codes in forensic science and compares them to other professions in light of major changes in criminology, science, and law during the half century since the first codes were developed. Among the issues he grapples with are recovering physical evidence, criticizing work not done, examining selective evidence, and attempting to avoid cross-examination. Appended relevant texts comprise nearly half the volume. Annotation c. Book News, Inc., Portland, OR (booknews.com)