you need to maintain your EMT certification. what you don't have to do is attend the new refresher classes, as it's assumed that since you teach it, you already know the material. But you still need your elective CEUs.
and there is no NJ EMS department, you would need to direct your question to the NJ Dept of Health & Senior Services Office of Emergency Medical Services http://www.state.nj.us/health/ems/
This may be different in New Jersey, but in New York my EMT-B instructor was given CME's for teaching the class along with the skills instructors. He still had to recert, but it just made it easier
