On Christmas Eve, Governor Brown ordered new DNA testing on four pieces of evidence in the case of Kevin Cooper, who was convicted of murdering a couple, their ten year old daughter and an 11 year old boy in Chino Hills in 1983

In this link you can hear a radio interview with the lawyer of Kevin Cooper, a journalist and Richard Eikelenboom of IFS.

DNA of the Kevin Cooper was found on some incriminating locations of evidence. There are indications that (blood) evidence could have been planted.  Eikelenboom is convinced that new (touch) DNA-investigations can help solve this very complicated case.

More about the the Kevin Cooper case on wikipedia.

The New York Times als has an article with a lot of information about the case.