I actually know someone who got one done in 2006. From what I remember, it was one of those don't ask don't tell deal. However it was understood that the organ came from executed prisoner. It saved her life. I don't know anything about what goes into ensuring donor's organ is a reasonable match, but I'm not too sure if the waiting period for her was that long. Anyway I do remember it became much more difficult for foreigner to get transplant shortly afterwards but this article seems to indicate the trend is reversing with institional practice.