In June, Harris - who lists his occupation as 'attendant' - was charged with illegally accessing the woman's details on the police database.
The charge carries a penalty of up to two years in prison.
Harris was a police officer stationed at Pukekohe from early 2007, and it is alleged he accessed the police database a month before his resignation in April last year.
Acting Assistant Commissioner Richard Chambers said there were strict controls on access to information held in the National Intelligence Application (NIA), which holds information on a person's personal details and if they have criminal history.
"There is regular monitoring of NIA access including an audit carried out each month on approximately 75 randomly selected employees using the NIA database for that month," he said.
"These employees are required to justify their NIA access for that month."
Harris will be sentenced next month.