Argumentum Ab Auctoritate Fortissimum Est In Lege Law and Legal Definition

Argumentum ab auctoritate fortissimum est in lege means reasoning from authority is most valid in law. An argument supported by authority carries the greatest weight in law. This is because arguments from authorities form part of informal logic. Normally, when a person has little knowledge of a certain matter, the person depends on the knowledge of an expert in the issue. To support a proposition authoritative arguments supporting it make courts believe it to be true.