Legislation that changes the way certain charter schools are authorized in Tennessee is headed to the Senate floor. The proposal passed the Senate Finance Committee 7-3 Wednesday evening and was sent to the full Senate. The advancing measure is one of at least three versions that have been proposed. Currently, local school boards decide whether to authorize a charter application. If approved, the latest proposal would authorize the state Board of Education to oversee the charter schools in failing counties. There are currently 48 charters operating in Tennessee.