To establish that an advertisement is false, a plaintiff must prove five things: (1) a false statement of fact has been made about the advertiser's own or another person's goods, services, or commercial activity; (2) the statement either deceives or has the potential to deceive a substantial portion of its targeted audience; (3) the deception is also likely to affect the purchasing decisions of its audience; (4) the advertising involves goods or services in interstate commerce; and (5) the deception has either resulted in or is likely to result in injury to the plaintiff. The most heavily weighed factor is the advertisement's potential to injure a customer. The injury is usually attributed to money the consumer lost through a purchase that would not have been made had the advertisement not been misleading. False statements can be defined in two ways: those that are false on their face and those that are implicitly false.
Law Library - American Law and Legal InformationFree Legal Encyclopedia: Ex proprio motu (ex mero motu) to FileFalse Advertising - Proof Requirement, Development Of Regulations, Types Of False Advertising, Trademark Infringement, Parody, Remedies For False Advertising