Jessica says that Johnny went to Herbert Hoover School in Waterloo, Iowa. There is a Hoover School in Waterloo, but it was named for Lou Hoover, was a native of Waterloo.
When Jessica and the detective were in the room after the lady reporter was found dead, Jessica picked up a small piece of glass and handed it to the detective who put it in a plastic bag. Neither of them were wearing gloves to protect the evidence. There could have been fingerprints on the piece of glass.