Rule 24-3-4.1 - Provisionally Certified Intellectual and Developmental Disabilities Therapist Requirements - PCIDDTA. In order to be eligible to apply for the DMH Provisionally Certified Intellectual and Developmental Disabilities Therapist credential (PCIDDT), an individual must meet ALL of the requirements listed below: 1. Employment Requirement; 2. Education Requirement; 3. Ethics Requirement; AND, 4. Criminal Background Checks Requirement. B. The Employment, Education, Ethics and Criminal Background Checks requirements are outlined in the "DMH IDD Therapist Certification Requirements - Categories and Descriptions" section of this chapter. Section 41-4-7 of the Mississippi Code of 1972, Annotated