"Chinnis said he heard a rumor that a homeowner near the trail who didn’t like bicyclists was to blame for the tacks, but the Sheriff’s Office had no evidence that was the case."
"Gippert said the fact that it happened in two separate locations made it more likely that it was kids responsible for the vandalism."
There's some real detective work, since it was done in two different locations, it must be some nameless kids that are involved, since adults would not do such a thing.