Not sure if you have this already, but here is an Australian study looking at prehospital IN fentanyl.
Rickard, C., O’Meara, P., McGrail, M., Garner, D., McLean, A., & Le Lievre, P. (2007). A randomized controlled trial of intranasal fentanyl vs intravenous morphine for analgesia in the prehospital setting. American Journal of Emergency Medicine, 25.