http://www.latimes.com/news/local/la-me ... california
IN BRIEF / CHINO HILLS
Tests Show Police Didn't Plant Blood EvidenceFrom Times Staff and Wire Reports

October 30, 2004

The state attorney general's office Friday said that new DNA tests proved that police did not plant blood evidence at the scene of a quadruple murder in Chino Hills in 1983.

Attorneys for Kevin Cooper, who was convicted of the murders, earlier this year won a stay of execution in part because of a contention that police investigators may have smeared their client's blood on a T-shirt found near the murder scene.

They requested a special test to determine if the bloodstain contained the preservative EDTA, which they said would indicate it came from a vial of blood that had been collected from Cooper after the murders.