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Very recently we had a cold-case here in Norway, old murder from the 90s (The murder of Birgitte Tengs), where the most recent suspect was first found guilty, but then acquitted on an appeal.

Back in the 90s police had found DNA on her leggings/pantyhose, which years later matched with him.

But they could not prove beyond a reasonable doubt that the DNA had gotten there through direct physical contact - as his DNA could have gotten there by them simply sharing some surface, like sitting on the same chair at a gas station.