105 CMR, § 803.100
The Department shall issue a certificate of Certified Health Officer to any individual upon satisfactory completion of all applicable certification requirements. An applicant who is not eligible for certification by reciprocity pursuant to 105 CMR 803.230 must meet the education and experience requirements of 105 CMR 803.200 and satisfactorily pass the examination required by 105 CMR 803.220.
If an applicant is found qualified by the Department, the applicant shall be certified by the Department as a Certified Health Officer, with the right to use the title Certified Health Officer and the letters "C.H.O." or "CHO". No individual may assume such title or list the credentials of Certified Health Officer (C.H.O. or CHO) to indicate that the person is a currently Certified Health Officer unless so certified by the Department.
105 CMR, § 803.100