The criminal trial of Gwinnett County Superior Court Judge Kathryn Schrader began Tuesday, with jurors hearing how the judge’s bewilderment at repeatedly finding unauthorized documents on her court computer system turned to frustration, then exasperation when county tech staffers were unable to pinpoint her problems.

Schrader ultimately turned to a private investigator, who in turn enlisted a computer expert with a criminal record to install a device to monitor her court computer. Schrader suspected District Attorney Danny Porter and his office were monitoring her computer, her lawyers said.