Final answer:
Legally, a massage therapist's advertisement must be truthful, non-deceptive, and must not include false or misleading claims; it should clearly state licensure and substantiate any benefit claims, with material details disclosed to prevent fraud.
Step-by-step explanation:
Legally, the advertisement for a massage therapist must comply with local, state, and federal laws, which can vary by jurisdiction but generally include requirements that the advertising is truthful and non-deceptive, and does not make false or misleading claims. Specific requirements may also demand that licenses or certifications be clearly stated and that any claims about the benefits of the massage therapy are substantiated. Moreover, if a commercial transaction is being advertised, any material details that could influence the consumer's decision must be disclosed upfront to avoid the commission of fraud.