Prosecutors in the trial of six officers charged in the death of Freddie Gray filed notice that they intend to use DNA evidence and will present an expert on knives, according to new court filings.

In filings Wednesday, which were made available Friday, prosecutors filed a formal notice of intent to use DNA — a requirement by law — and said they have consulted with and plan to call experts in serology and DNA. Prosecutors do not explain who the DNA belongs to or how it factors into the investigation.

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Previous court filings show investigators applied for a search warrant to look for possible DNA on the uniform of Officer Caesar Goodson. Goodson, who drove the transport wagon in which authorities believe Gray was injured, has since been charged with second-degree murder.

Prosecutors also say they also intend to call an expert "regarding knife mechanics, knife history and knife sales."

The initial arresting officers had charged Gray with possessing an illegal switchblade knife, after he ran from officers on a West Baltimore corner.

In announcing charges against the officers on May 1, prosecutors said a switchblade knife was not illegal under Maryland law, but defense attorneys for the officers countered that it is prohibited under city code. Prosecutors later said they inspected the knife and determined it was not a switchblade at all.

Prosecutors said the "more relevant matters" were "Gray's injuries and what the defendants did to prevent and care for those injuries." But the knife figures prominently into charges against Officers Edward Nero and Garrett Miller, who face charges of misconduct in office and reckless endangerment for taking Gray into custody.

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