The state says forensic scientists from its Bureau of Criminal Investigation have now tested 10,000 rape kits submitted by law enforcement agencies around Ohio to check for possible DNA matches.
Attorney General Mike DeWine says the testing that led to that milestone helped identify hundreds of alleged attackers.
He launched the initiative in 2011 to check previously untested kits for evidence. Authorities from more than 250 law enforcement agencies have submitted over 12,200 rape kits, including some that were decades old.
Under a law that took effect last year, such agencies have until next month to submit any remaining older kits.
Newly collected rape kits must be turned over within 30 days after an agency determines a crime has been committed.