Every 10 seconds in the United States, there is a report of suspected maltreatment of a child, the equivalent of over 3 1/2 million calls per year. In three recent child abuse murder cases, Hayes+Associates (H+A), a Corvallis, OR consulting firm specializing in injury biomechanics, was called upon to provide expert testimony as to whether a child died by abuse or by unintentional trauma. In each instance, trial verdicts were consistent with H+A findings.