Instructor/Examiner & Clinical Supervisor (CNA, CMT and Insulin Registry) ← Knowledge Base As an instructor, how many CNA students may I have in class? I would like to become a CNA instructor/examiner, what are the qualifications? What are "Train the Trainer" classes and where do I go for them? As an examiner may I refuse to retest a student that has failed the first time? As an examiner may I refuse to test a student that is disruptive or disrespectful?