The inspector will inspect the portion of the main sewer line from the entry point to the destination or farthest point reached.  The inspector attempts to reach either the main city sewer connection or the septic tanks in the event of a septic system.  Reaching the destination is not always possible as there could be excessive bends from the entry point making it impossible to push the camera, or debris / roots / damage in the line that prevents going further.  The portion of the sewer line inspected will be commented upon in the report and video provided.
All sewer drain lines are not inspected, or that portion of the main line from point of entry to the farthest point reached.