On Friday, Ohio Auditor Dave Yost acknowledged that a probe has been ongoing for a year. Meanwhile, court documents filed this month in Florida indicate 19 Ohio charter schools were overbilled nearly $600,000. Prosecutors and forensic accountants say the money was laundered through 150 bank accounts and shell companies then returned as “rebates” and “kickbacks” to Marcus May, who once ran more than 20 charter schools in Ohio.