I actually watched an episode of Bones, and there was a deaf girl they found who was covered in blood and wouldn't talk/sign to them at all, and they didn't know where she was from. They were videotaping the interview, and she asked if she could go to the restroom, and they found out exactly where she was from by the way she signed it (regional differences)! It was amazing!! Turns out she was a victim of domestic abuse.. So yes, they can do the same with a deaf person!
