Grassley thought that Hatfill was being singled out in the anthrax investigation, even though he had never been charged with a crime.

CNN: Anthrax agents hunt lab equipment in pond

Though Ramos has been considered a key focus of the probe for years, he has never been charged in the case.

CNN: After suspension, search for Etan Patz to resume Monday

Though Ramos has been considered a key focus of the investigation for years, he has never been charged in the case.

CNN: Basement search for Etan Patz clues ends