Determining whether a child was sexually abused is a tremendous clinical and legal challenge. In litigation, abuse is established--proven--with evidence. Evidence includes testimony from witnesses, hearsay statements, documents, and physical evidence such as semen, genital injury, and fingerprints. There are two types of witnesses: lay witnesses (sometimes called percipient witnesses) and expert witnesses. In sexual abuse litigation, expert testimony is provided by medical and mental health professionals. Whereas physicians and nurses describe physical evidence of abuse, mental health professionals describe psychological evidence of abuse. Both types of expert testimony are complicated and, to varying degrees, controversial. Because accurate expert testimony is so critical, Kathryn Kuehnle and Mary Connell's 2009 book "The Evaluation of Child Sexual Abuse Allegations: A Comprehensive Guide to Assessment and Testimony" is an important contribution to the literature. Bringing together many of the world's leading experts, Kuehnle and Connell's book materially advances the field. Yet, like any scholarly endeavor, aspects of Kuehnle and Connell's book are subject to critique and disagreement. Indeed, some points in their book are, to the author's way of thinking, not only open to debate but are just plain wrong. (Contains 3 notes.)