To help prevent the sexual abuse of students in public K-12 schools, 46 of the 50 states and the District of Columbia surveyed by GAO required background checks of applicants–such as teachers or bus drivers–seeking public school employment; however, the methods and sources varied widely. Forty-two states established professional standards or codes of conduct for school personnel, and 22 of those included information on appropriate boundaries between personnel and students. Although experts view awareness and prevention training on sexual abuse and misconduct as another key prevention tool, only 18 states reported in the survey that they require school districts to provide this training. However, two of six districts GAO visited provided training to school personnel, volunteers, and students in response to prior allegations of sexual misconduct by school personnel. These trainings covered a variety of topics, including recognizing the signs of abuse and misconduct.