Do you have to be certified to be a vet tech in NC?

Yes, you must be credentialed. In North Carolina the credential granted is "registered veterinary technician". The laws in North Carolina reserve the use of the titles "vet tech" or "veterinary technician" for someone who has a degree from an AVMA accredited veterinary technology program, has passed the Veterinary Technician National Exam and the state board exam and is currently registered with the North Carolina Veterinary Medical Board.