Unity Interception - Custom Interception Behaviour
var companies = methodReturn.ReturnValue as IEnumerable<ICompanyId>;
List<string> filter = CompaniesVisibleToUser();

methodReturn.ReturnValue = companies.Where(company =>
    filter.Contains(company.CompanyId)).ToList();

public IList<ApplicationLayerDtos.EmployeeOverviewDto> GetEmployeesOverview()
    {
        return _appraisalService.GetEmployeesOverview();
    }