Sometimes, it so happens that I do some research for a story and find that a major plot point could never work in real life. At this stage, I can either continue with my impossible (for a non-fantasy, non-scifi setting) idea, or scrap it completely.
This happened to me earlier while I was writing fan fiction - given the informal nature of it, I simply let my character survive a wound that he shouldn't have survived, and then left a note at the bottom about what would have really happened.
How can I do this in a more formal setting, like a short story or a novel? Assume that I can't incorporate the research without reworking a lot of my story.