From Amway themselves:
Better Business Bureau Membership The Better Business Bureau (BBB) does not permit the use of its name in connection with advertising for products or services. The BBB name and symbol are federally registered service marks and, hence, using its name or symbol without permission may violate federal law.
You should not use the name or seal of the BBB in any printed materials that go to the general public or in advertisements, nor should you represent or imply to the public, either orally or in writing, that Amway or its products or services are endorsed by the BBB.
This includes asking a prospective IBO or registered customer, or other customer to call the BBB as a reference. Such a request is viewed by the BBB as an implied endorsement, which is impermissible.
IBOs who are members of a local BBB may display membership plaques,certificates, or decals in their offices that are issued by the BBB for this purpose. They may also notify their downline IBOs, through a bulletin or letter that goes only to IBOs, of the fact that they are a member of a BBB.
The Council of Better Business Bureaus, Inc. (CBBB), of which Amway is a member, has provided a fact sheet about Amway to more than 140 local BBBs. Thus, local BBBs that are members of the CBBB are prepared to answer questions from the membership or the general public about Amway.
Local BBBs that are not members of the CBBB can secure such data from the West Michigan BBB, which maintains current information on Amway.
Dun & Bradstreet Reports Dun & Bradstreet financial reports are not to be used in the course of registering new IBOs. This report pertains only to Amway's creditworthiness and is not meant to be used as an investment rating. The business opportunity is not an investment security. All Dun & Bradstreet financial reports are confidential and reserved for the exclusive use of their subscribers. Although you may indicate Amway's soundness when registering others into the business, using Dun & Bradstreet reports for such purpose is prohibited.