There are a few good reasons, however, why donated organs aren't often re-gifted. If the organ is coming from someone who was so sick that he needed a new organ, it probably lived a pretty rough second life. What's more, dying involves the entire body shutting down. "The trauma of dying can injure an organ," says Robert Montgomery, the director of the Comprehensive Transplant Center at Johns Hopkins University. "And then the second person dies, and the organ is taken out again. That's more injury." But the main problem with playing hot potato with an organ is the scar tissue that forms on it within weeks after the first surgery. That tissue must be removed before a second transplant, and doing so can injure the organ too much to make it worth re-donating.