Lawyers and certified public accountants (CPAs) follow professional advertising rules in addition to general consumer-protection law. States adopt their own versions, so details vary.
Lawyers: American Bar Association (ABA) Model Rule 7.1 bars false or misleading statements about a lawyer's services.
Lawyers: Model Rule 7.2 limits saying you are "certified" as a specialist unless an approved or ABA-accredited body certified you and you name it.
Lawyers: Model Rule 7.3 restricts live person-to-person solicitation for pay; check your state's version.
Lawyers: testimonials, disclaimers, and past-result claims are handled differently by each state bar.
CPAs: the AICPA Code bars advertising that is false, misleading, or deceptive; your state board of accountancy may add rules.
Rules vary by state, locality, and profession, and they change. This is general information, not legal advice; confirm with a qualified attorney for your situation.