There are two things. We accept just about anything in evidence, from statements to newspaper articles to recordings—the whole nine yards. With respect to uncontradicted evidence, what we're talking about is contradiction between documents, which are the most common evidence, and some document within the file.
If a document comes to a conclusion about a car accident, and there's another document that says something else about it, that's a contradiction that we're going have to resolve. If there's only one view with respect to those facts, then we accept it.