It will be tested for DNA and other biological evidence at the department’s Serology Unit next week, sources told the site.

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Cops who saw the weapon said it appeared to have blood residue on it, but it’s extremely rusted and stained, so further testing is needed.

The construction worker who found the knife told police he stumbled upon it while Simpson’s home in Brentwood was being demolished, but he couldn’t remember the exact date, sources told TMZ.

After finding the blade, he took it to an LAPD officer standing across the street, according to TMZ.

But the cop was off-duty — and instead of turning the knife over to his higher-ups, sources said he kept it for years.

In late January, he contacted a friend in the homicide division — and told him he was getting it framed for his wall.

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