Interesting but true, DNA can sometimes lie. Some people have two
entirely different DNA's and don't even know it! The medical data is
incomplete on this newly discovered phenomena so who knows how many of
those freed criminals are truly innocent just because the DNA seems to
"prove" it??See articles:
http://www.thetech.org/genetics/ask.php?id=23
Here is an article on suggestions for a mandatory DNA database:
http://www.washingtonpost.com/wp-dyn/content/article/2005/09/23/AR2005092301665.html