Definitions by US Legal resources:
Expert Endorsement by Media
The journalistic expert doing the endorsement should be an expert. Furthermore the expert must also have evaluated the campaign and its propose using appropriate techniques; he/she must be qualified in the relevant area. A surgeon is not by definition an expert on pharmacology. The endorsement should be backed up by noted research, evaluations, and/or comparisons of options. Many editors and reporters attempt to create an "air" of expertise in the presentation of their expertise, but close examination will show that a media endorsement does not meet the requirements of an expert presentation.