Unfortunately there are quite a few businesses where laws or regulations severely limit or prohibit the use of testimonials. Dentists in most states are prohibited by their state boards from any promotion stating they are better than any other dentist. We can’t have that!
SEC regulated activities (financial planners and investment funds for example) are also severely regulated in that regards.
Many states have laws requiring specifically worded notices when offering free or discounted items in advertising.
The U.S. federal CAN-SPAM law has requirements for any commercial email, such as including your company name and address.
Sending un-solicited faxes is a violation of federal law.
Telemarketing to home phone numbers on the “Do Not Call” registry is illegal.
Know the laws and regulations that apply to your marketing efforts.