Superintendent Alberto Carvalho of Miami-Dade County Public Schools says he knows how much gets paid out in health care claims, but the school system's insurance carrier, Cigna, won't disclose the charges. Lynne Sladky/AP hide caption

itoggle caption Lynne Sladky/AP

This encampment under the Julia Tuttle Causeway in Miami, shown in 2008, was cleared out by authorities in 2009. It was home to sex offenders who were unable to find places where they were permitted to live under Miami-Dade County's strict residency law. Although this makeshift community was broken up, homeless sex offenders continue to camp out in other areas of the county. David Adame/AP hide caption

itoggle caption David Adame/AP