02-288-14 Me. Code R. § 4
A certified interior designer shall display the legend "Maine Certified Interior Designer" in all advertising and promotional materials published by or on behalf of the named certified interior designer that relate to interior design services for Maine-located projects. Such materials include but are not limited to telephone directories, newspaper and magazine advertisements, and web sites.
A certified interior designer shall display the legend "Maine Certified Interior Designer" on the certified interior designer's business card and beneath the certified interior designer's name on all professional correspondence, proposals and solicitations signed by or on behalf of the named certified interior designer for Maine-located projects.
02-288 C.M.R. ch. 14, § 4