Membership Versus Certification: CDPWS/NAADAC membership stands separately from the NAADAC National Certification. You may become a member of CDPWS and NAADAC with full member benefits and may or may not hold the NAADAC NCACI, NCACII or MAC Certification. NAADAC Certification requires a separate application process. Go to www.NAADAC.org for Membership Application or Certification inquiries.