Md. Code, Business Occupations and Professions § 9.5–102

Notwithstanding any other provision of law, a person may not:

(1) operate a crane in the State for the purpose of construction work or demolition work unless the person holds a Certificate of Competence; or

(2) authorize a person to operate a crane in the State for the purpose of construction work or demolition work unless the operator holds a Certificate of Competence.