FWIW
http://www.lawlib.state.ma.us/source/mass/cmr/cmrtext/940cmr3.pdf#page=7
3.02: False Advertising
(2) No statement or illustration shall be used in any advertisement which creates a false impression of the grade, quality, make, value, currency of model, size, color, usability, or origin of the product offered, or which may otherwise misrepresent the product in such a manner that later, on disclosure of the true facts, there is a likelihood that the buyer may be switched from the advertised product to another.
Even though the true facts are subsequently made known to the buyer, the law is violated if the first contact or interview is secured by deception.
.....
3.05: General Misrepresentations
(1) No claim or representation shall be made by any means concerning a product which directly, or by implication, or by failure to adequately disclose additional relevant information, has the capacity or tendency or effect of deceiving buyers or prospective buyers in any material respect. This prohibition includes, but is not limited to, representations or claims relating to the construction, durability, reliability, manner or time of performance, safety, strength, condition, or life expectancy of such product, or financing relating to such product, or the utility of such product or any part thereof, or the ease with which such product may be operated, repaired, or maintained or the benefit to be derived from the use thereof.
then:
http://www.mass.gov/ago/consumer-resources/consumer-assistance/93a-demand-letter.html