Viewers are Investigators with view-only privileges. In the real world they are not really Investigators. You will probably assign this role to departmental managers who simply need access to the investigative records and reports. Viewers can access all Candidate records and view reports for all cases within the organization. There is no information in the system they can change, nor can they add any information. Since no Candidates can be assigned to them, their menu system has fewer options than other Investigators.