This report discusses the preliminary results of a study that investigated arrest rates for adolescents who received community mental health services under Medicaid managed care programs in Hillsborough, Florida, and four surrounding countries. Results indicate many young recipients of mental health services were arrested in Hillsborough and nearby counties during 1995-1998. Almost one-third of all 14-16 year-old boys, and almost one-fifth of all 17-19 year-old boys in Hillsborough County were arrested each year, on average. In surrounding counties, the arrest rates varied from more than one-fifth for 14-16 year-old boys to more than one-fourth for 17-19 year-old boys. Arrest rates for girls were lower, but still quite high. In Hillsborough County, 19% of 14-16 year-old girls and 11% of 17-19 year-old girls were arrested each year on average. In the surrounding counties, almost one in ten girls in both age groups were arrested each year on average. When arrest rates for the year before treatment were compared to arrest rates for the year after treatment for boys, the results were not encouraging. For both groups in both regions, arrest rates during the year after treatment were significantly higher than arrest rates prior to treatment. (Contains 14 references.) (CR)