I don't care if they are working a second job on their own time (like evenings after work) without affecting their business hours. Other people do it all the time and government employees are people too trying to make a living. IMO, there is nothing wrong with working a second job outside the business hours of the regular job irrespective of whether the person is a government employee or not.
Furthermore, the initial pay for the case processing officer isn't much from what I know. It is around CAD 55,000 or something around that, which isn't much. So, working a second job might have been obligatory for the employee you mentioned.