In 2009, a 14-year-old boy showed up at a Chicago police station in uniform and worked 5 hours of a shift. He acquired a police radio, ticket book and rode with an officer for several hours before he was found out and later arrested. – WTF Fun Facts
Source: https://www.nbcchicago.com/news/local/14-year-old-reports-for-police-duty/2090036/