Document Experts determine whether…
a document was written by the person whose signature it bears
a document has been forged
a document has been altered by additives, deletions, obliterations, erasures, or photocopying
the handwriting is genuine
the entire document was printed on the same machine
a document was printed on the date it bears or before or after
two or more documents are significantly different or substantially the same
pages have been substituted in a document.