"Prisoners do not have a constitutional right to DNA testing after their conviction, the Supreme Court ruled yesterday, even though the technology provides an unparalleled ability both to exonerate the wrongly convicted and to identify the guilty. In the courts first examination of how to treat the rapidly evolving field of biological testing, Chief Justice John G. Roberts Jr. wrote for a majority that said it is up to the states and Congress to decide who has a right to testing that might prove innocence long after conviction. The challenges DNA technology poses to our criminal justice systems and our traditional notions of finality are better left to elected officials than federal judges, Roberts wrote in the 5-to-4 decision." http://www.boston.com/news/nation/w...t_rejects_inmates8217_right_to_have_dna_test/ Courts want finality. They do not want to know about wrongful convictions.