Prior GAO (US Government Accountability Office) testimonies have described cases of physical abuse of children at youth residential treatment programs and public and private schools. However, children are also vulnerable to sexual abuse. A 2004 Department of Education report estimated that millions of students are subjected to sexual misconduct by a school employee at some time between kindergarten and the twelfth grade (K-12). GAO was asked to (1) examine the circumstances surrounding cases where K-12 schools hired or retained individuals with histories of sexual misconduct and determine the factors contributing to such employment actions and (2) provide an overview of selected federal and state laws related to the employment of convicted sex offenders in K-12 schools. To identify case studies, GAO compared 2007 to 2009 data employment databases from 19 states and the District of Columbia to data in the National Sex Offender Registry. GAO also searched public records from 2000 to 2010 to identify cases in which sexual misconduct by school employees ultimately resulted in a criminal conviction. GAO ultimately selected 15 cases from 11 states for further investigation. For each case, to the extent possible, GAO reviewed court documents and personnel files and also interviewed relevant school officials and law enforcement. GAO reviewed applicable federal and state laws related to the employment of sex offenders and requirements for conducting criminal history checks. A summary of State Laws related to the hiring and retention of sex offenders is appended. (Contains 1 table and 35 footnotes.)