A criminal recor is a list of past crimes for which an individual has been convicted, or received an official reprimand or caution. In some jurisdictions it also includes arrests, charges pending, and even charges of which the subject has been acquitted (though critics claim this violates the presumption of innocence). In the United States, criminal records are compiled and updated on local, state, and federal levels by various law enforcement agencies. Their primary goal is to present a comprehensive criminal history. They may be used for many purposes, including identification, employment, security clearance, immigration, background checking, assistance in developing suspects in an ongoing criminal investigation, and for enhanced sentencing in criminal prosecutions. In the United States, these compilations are unlikely to be admissible in court as proof of arrest or conviction.