Ohn was recently convicted by a jury of committing fraud against his employer. After the trial, it was revealed that some key evidence against John used in trial was obtained through his employer's records and John's workstation computer. Before searching John's computer, the investigators did not have any evidence or idea that John was involved in the fraud. In fact, they stumbled on the fraud by accident. John is convinced that he has grounds for appeal. He believes the evidence found on his work computer is inadmissible because the investigators did not have probable cause to search his computer.

a. Is John right that he could appeal the guilty verdict?
b. Were his rights violated?