Courts are moving toward using the psychological evidence of the impact of abuse as proof of the acts having occurred even when there is no supporting physical evidence. New techniques in the understanding and identification of posttraumatic stress reactions and disorders and the various subcategories have made the psychological assessment of children who have been sexually abused a more reliable and valid method of confirming the diagnosis. The article discusses the legal standards for evaluations in terms of child abuse report laws, types of legal situations, criminal and dependency and neglect cases, and standards of proof. Forensic evaluations are discussed in the areas of suggestibility and bias, review of corroborating documents, gathering assessment data to answer legal questions, and case examples. The assessment of the sexually abused child, the legal assessment of the alleged perpetrator, the legal assessment of family members, the communication of findings, the expert witness testimony, and the ethical and liability issues are the final issues discussed in the article. 34 references (Author abstract modified)