Very little is known about sexual abuse among children that are regularly cared for by more than 1.3 million child care providers every week in the United States. In this context, GAO was asked to (1) provide an overview of federal and state laws related to the employment of sex offenders at child care facilities and (2) examine cases where individuals who were convicted of serious sexual offenses were subsequently employed or present at child care facilities. To provide an overview of selected laws, GAO searched for prohibitions against offenders being present at child care facilities, requirements for conducting criminal-history checks, and penalties for violating these requirements. The cases GAO examined focus only on individuals who were convicted of serious sexual offenses and cannot be generalized to all child care facilities. To identify the cases, GAO reviewed open-source information from 2000 to 2010. GAO also compared the years 2007 to 2009 in employment databases from 20 states and the District of Columbia to data in the National Sex Offender Registry. GAO ultimately selected 10 cases from eight states and the District of Columbia for review. For each case, GAO reviewed court documents and interviewed law enforcement personnel. Our methodology was not designed to assess the prevalence of sex offenders working at child care facilities. This product contains no recommendations. Where applicable, GAO referred its cases for further investigation