16 C.F.R. § 255.5 Disclosure of material connections.
Title 16 - Commercial Practices
When there exists a connection between the endorser and the seller of the advertised product which might materially affect the weight or credibility of the endorsement (i.e., the connection is not reasonably expected by the audience) such connection must be fully disclosed. An example of a connection that is ordinarily expected by viewers and need not be disclosed is the payment or promise of payment to an endorser who is an expert or well known personality, as long as the advertiser does not represent that the endorsement was given without compensation. However, when the endorser is neither represented in the advertisement as an expert nor is known to a significant portion of the viewing public, then the advertiser should clearly and conspicuously disclose either the payment or promise of compensation prior to and in exchange for the endorsement or the fact that the endorser knew or had reasons to know or to believe that if the endorsement favors the advertised product some benefit, such as an appearance on TV, would be extended to the endorser. Example 1: A drug company commissions research on its product by a well-known research organization. The drug company pays a substantial share of the expenses of the research project, but the test design is under the control of the research organization. A subsequent advertisement by the drug company mentions the research results as the “findings” of the well-known research organization. The advertiser's payment of expenses to the research organization need not be disclosed in this advertisement. Application of the standards set by Guides 3 and 4 provides sufficient assurance that the advertiser's payment will not affect the weight or credibility of the endorsement. Example 2: A film star endorses a particular food product. The endorsement regards only points of taste and individual preference. This endorsement must of course comply with §255.1; but even though the compensation paid the endorser is substantial, neither the fact nor the amount of compensation need be revealed. Example 3: An actual patron of a restaurant, who is neither known to the public nor presented as an expert, is shown seated at the counter. He is asked for his “spontaneous” opinion of a new food product served in the restaurant. Assume, first, that the advertiser had posted a sign on the door of the restaurant informing all who entered that day that patrons would be interviewed by the advertiser as part of its TV promotion of its new soy protein “steak”. This notification would materially affect the weight or credibility of the patron's endorsement, and, therefore, viewers of the advertisement should be clearly and conspicuously informed of the circumstances under which the endorsement was obtained.
Assume, in the alternative, that the advertiser had not posted a sign on the door of the restaurant, but had informed all interviewed customers of the “hidden camera” only after interviews were completed and the customers had no reason to know or believe that their response was being recorded for use in an advertisement. Even if patrons were also told that they would be paid for allowing the use of their opinions in advertising, these facts need not be disclosed. [Guide 5] [45 FR 3873, Jan. 18, 1980]
Title 16: Commercial Practices
PART 255—GUIDES CONCERNING USE OF ENDORSEMENTS AND TESTIMONIALS IN ADVERTISING
§ 255.5 Disclosure of material connections.

