http://www.nytimes.com/learning/students/pop/articles/19scotus.html
The Supreme Court of the United States ruled on Thursday, 5-4, that defendants don’t have a right under the Constitution to test evidence against them for DNA matches that could serve to prove their innocence.
The ruling may not have a very wide effect, though, since most states have laws on the books that allow access to DNA tests for at least some defendants, for example, those who are willing to swear that they’re innocent.