In the UK the Advertising Standards Committee have this code about sales, promotion and marketing - The CAP Code Index
Some of the relevant things it says are:
All marketing communications should be legal, decent, honest and truthful
All marketing communications should be prepared with a sense of responsibility to consumers and to society.
The Code is applied in the spirit as well as in the letter.
Marketers should deal fairly with consumers.
Before distributing or submitting a marketing communication for publication, marketers must hold documentary evidence to prove all claims, whether direct or implied, that are capable of objective substantiation.
If there is a significant division of informed opinion about any claims made in a marketing communication they should not be portrayed as generally agreed.
Marketers should not exploit the credulity, lack of knowledge or inexperience of consumers.
No marketing communication should mislead, or be likely to mislead, by inaccuracy, ambiguity, exaggeration, omission or otherwise.
Marketing communications should not condone or encourage unsafe practices. Particular care should be taken with marketing communications addressed to or depicting children
Marketers should hold signed and dated proof, including a contact address, for any testimonial they use. Unless they are genuine opinions taken from a published source, testimonials should be used only with the written permission of those giving them.
Testimonials alone do not constitute substantiation and the opinions expressed in them must be supported, where necessary, with independent evidence of their accuracy. Any claims based on a testimonial must conform with the Code
Unless they are genuine statements taken from a published source, references to tests, trials, professional endorsements, research facilities and professional journals should be used only with the permission of those concerned.
Marketers should not display a trust mark, quality mark or equivalent without having obtained the necessary authorisation. Marketers must not claim that they, or any other entity that features in their marketing communications, or their products have been approved, endorsed or authorised by a public or private body if it has not or without complying with the terms of the approval.
Guarantees may be legally binding on those offering them. The word 'guarantee' should not be used in a way that could cause confusion about consumers' legal rights. Substantial limitations on the guarantee should be spelled out in the marketing communication. Before commitment, consumers should be able to obtain the full terms of the guarantee from marketers.
Marketers should inform consumers about the nature and extent of any additional rights provided by the guarantee, over and above those given to them by law, and should make clear how to obtain redress.
Marketing communications should not mislead consumers about who manufactures the product.
Some of the relevant things it says are:
All marketing communications should be legal, decent, honest and truthful
All marketing communications should be prepared with a sense of responsibility to consumers and to society.
The Code is applied in the spirit as well as in the letter.
Marketers should deal fairly with consumers.
Before distributing or submitting a marketing communication for publication, marketers must hold documentary evidence to prove all claims, whether direct or implied, that are capable of objective substantiation.
If there is a significant division of informed opinion about any claims made in a marketing communication they should not be portrayed as generally agreed.
Marketers should not exploit the credulity, lack of knowledge or inexperience of consumers.
No marketing communication should mislead, or be likely to mislead, by inaccuracy, ambiguity, exaggeration, omission or otherwise.
Marketing communications should not condone or encourage unsafe practices. Particular care should be taken with marketing communications addressed to or depicting children
Marketers should hold signed and dated proof, including a contact address, for any testimonial they use. Unless they are genuine opinions taken from a published source, testimonials should be used only with the written permission of those giving them.
Testimonials alone do not constitute substantiation and the opinions expressed in them must be supported, where necessary, with independent evidence of their accuracy. Any claims based on a testimonial must conform with the Code
Unless they are genuine statements taken from a published source, references to tests, trials, professional endorsements, research facilities and professional journals should be used only with the permission of those concerned.
Marketers should not display a trust mark, quality mark or equivalent without having obtained the necessary authorisation. Marketers must not claim that they, or any other entity that features in their marketing communications, or their products have been approved, endorsed or authorised by a public or private body if it has not or without complying with the terms of the approval.
Guarantees may be legally binding on those offering them. The word 'guarantee' should not be used in a way that could cause confusion about consumers' legal rights. Substantial limitations on the guarantee should be spelled out in the marketing communication. Before commitment, consumers should be able to obtain the full terms of the guarantee from marketers.
Marketers should inform consumers about the nature and extent of any additional rights provided by the guarantee, over and above those given to them by law, and should make clear how to obtain redress.
Marketing communications should not mislead consumers about who manufactures the product.