Prosecutors can run DNA tests on a pair of suspected bloodstains found at a Naperville home where two children were stabbed to death in October, a judge ruled Friday.
The stains were on a kitchen drawer and on the handle of an exterior sliding-glass door at the home where 7-year-old Justin Plackowski and 5-year-old Olivia Dworakowski were slain, DuPage County State's Attorney Bob Berlin said.
Plackowski's mother, Elzbieta Plackowska of Naperville, has been charged with repeatedly stabbing the children while looking after them at Olivia's home in Naperville.
The DNA testing required a judge's approval because it will effectively destroy the evidence and prevent further analysis. The defense did not object, and Judge Robert Kleeman signed off on the request.
"It's a onetime deal," Berlin said.
In February, the judge ordered Plackowska, 40, to provide hair and saliva samples for comparison against a blood-soaked knife believed to be the murder weapon and strands of hair found in the hands of the young victims.
Plackowska told investigators she killed her son to get back at her husband and Olivia because she was a witness, according to prosecutors, who turned over about 500 pages of police reports and other discovery materials to the defense on Friday.
Plackowska has pleaded not guilty and remains jailed without bond. Her next court date is May 10.