Actually the worst they could do is decide you are dishonest and put you on a Do Not Hire list, which you likely would not even know about other than just never getting calls to interview. Don't fudge or misrepresent yourself. Integrity holds heavier weight in this profession than in most any other. An externship is an externship, not nursing experience in any capacity.You were exposed to nursing practice. You were not, however, practicing as a nurse nor did you have the responsibilities that brings. Therefore you did not garner nursing experience. You did, however, gain exposure that others may not have and this may benefit you if you play your cards correctly. Believe me, if you call that clinical experience on a resume, nobody will be fooled by it. You simply will be chalked up to lacking integrity and at best be overlooked and at worst black-balled. Externships are common and everyone who works in nursing and HR knows the difference between working as an RN and working as an extern.