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They won't test for DNA unless they have a suspect to compare it against, usually, otherwise that DNA has no purpose. It's hard to prove that any single piece of trash at a park would be linked to the abductor - even a condom, because two teens could be fooling around - especially in such a remote area. It doesn't mean they were involved in the abduction. It's easier when the abduction takes place inside a house, because there aren't as many people coming in and out of a house as a park. I doubt any trash found at the park would provide concrete evidence as belonging to the abductor(s), unless said trash was found right next to the bikes.
I would say right next to the bodies, not the bikes.