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In some cases, existing samples may be too small to retest, the department said.

Scott Peterson, convicted in 2004 for the murder of his pregnant wife Laci Peterson and unborn son, has been granted a DNA retest on crucial evidence.

In May, a judge denied Peterson’s legal team’s request to retest the mattress.

They included changing rules to stop drivers booking tests before they are ready and lengthening the wait for a retest for those who fail.

This year, the military will start giving cognitive tests to all new troops and will retest them every five years, to watch for signs of mental decline.