Yes, a certified nursing assistant in one state may apply for certification by endorsement/reciprocity in a new state. If the application is accepted and all the endorsement/reciprocity criteria are met, then you will hold a CNA certificate in more than one state. Both certificates are valid and you are eligible to work in both states. Some states require reciprocity applicants to pass the CNA exams while others do not. You can verify this information by calling the nurse aide registries of both states. You need to meet the renewal requirements of both states if you want to keep both licenses active.