I'm watching Twin Peaks on DVD. its at the point were Josie and Sheriff are talking and she's wearing a black nigh gown. two things popped in my head right about now: either Josie is a really good actress or that Sheriff Truman was so blinded by love that he couldn't see who Josie really was.
I think if it was real life most of the people she came in contact with would probably suspect that she was up to something.