Gonefishing

Hello. I'm an LPN of 5 years with health and rehab experience. My background is squeaky clean, license clear, and have been trying to get into correctional nursing since day 1. I had a really great interview a few months ago and was basically promised 1 of 2 positions with an ability to cross train and was really excited it was finally going to happen. Did my background and drug test and was waiting for an orientation date only to be let down by calling a week later to find out I was again passed over. I'm at a loss of why there's an abundance of these jobs in my area yet I can't seem to get in. I've had excellent interviews and offers and seem to get lost in the shuffle after an offer. Any input would be appreciated