TALLAHASSEE — State law enforcement officials said Thursday they alerted the Citrus County Sheriff's Office six months ago of potentially missing sexual offenders, including the man charged this month with abducting and murdering Jessica Lunsford. But officials at the sheriff's office said Friday they could not verify whether they ever received the letter. It required them to verify the addresses of 58 sexual predators or offenders in the county who had possibly violated their sexual offender registration requirements. If the system had worked correctly, John Couey might have been arrested in November and could have been behind bars at the...