Del. Code tit. 24, § 3015

No person shall hold himself or herself out to the public as a licensed mental health or chemical dependency professional unless the person is licensed in accordance with this chapter. It shall be unlawful for a person who is not licensed under this chapter, or the person’s employer, employees, agents or representatives, to use, in connection with the person’s name or business, any words, letters, abbreviations or insignia indicating or implying directly or indirectly that the person is licensed under this chapter.