Authority
This source of knowledge is about Authority is often used and it is not the primary source. had to know that abuse of power is an impeachable offense by means of some other source is an authority, intuition, or sense experience. however, often leads to unreliable knowledge sine authorities can be wrong.
Therefore accepting a claim on authority, it should be ensure that person is really an expert in that particular field of knowledge, and suspend judgment investigate the prior source of knowledge if there are disagreements between different authorities, and accept a statement on authority on the one that can be assured that it can be investigate the source.