I'm going to try and keep things I've... er, "Noticed" confined to this thread. redundant threads are popping up left and right. Anyway, here goes...
Remember the bandages on the doc's arm? She said that you'd see a lot of people with "Injuries." The odd thing is that she said she burned her arm in surgery. HUH? Who uses flames to operate?
They have electricity.
So, here goes:
The injuries are from some form of punishment. That's more theory than observation though.