What exactly do you mean by that?
Many people claim that it was "written" by Joseph Smith. What I say is, how could a 14 year old boy, confused about religion, with a 4th grade home education, who lived on a farm in the 1800s, who had to read in the bible (James 1:5) to ask of God before realizing he could do so, have written such a book?
Here's a really good website that is about the testing of the validity of the Book of Mormon:
www.the-book-of-mormon.com
H-D