"There are certain protocols that they've got to comply with around security, around appropriate use of computers - and that applies with access of information and usage, and the use of log-ins and passwords.''
Employees were expected to comply with those rules, he said.
Mr Wallace said the department had an auditing system to catch people using computers improperly.
"Some of our staff deal with sensitive information and we expect a high level of compliance with our procedures and a high level of integrity in dealing with that,'' he said.
"The charges are [that] she accessed information in an unauthorised way for her own immediate benefit rather than for any ongoing criminal stuff.''
Bates is due to reappear in court next week.