DALLAS, Texas (1080 KRLD) – A Dallas County judge has signed off on more DNA testing for convicted murderer Darlie Routier of Rowlett.

Routier is on death row for the 1996 murder of her son.

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Defense attorneys are hoping a new round of tests on the murder weapon, clothes and linens will show a stranger’s DNA. But former prosecutor Toby Shook says more times than not the tests come back negative.

Shook says DNA testing is a slow process and will push the execution date back further, but adds “The way the law is now, no one is going to rush through this thing, there will be plenty of testing done.”

Routier was convicted in 1997 of killing her 5-year-old son Damon a year earlier. She was also was charged with killing Damon’s 6-year-old brother, Devon, but was not tried for the death.

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Routier contends an unidentified intruder killed the boys and stabbed her in their home.

Her husband Darin Routier filed for divorce in June 2011 – but he still believed she was innocent.

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