I don't think anyone was arrested in either the Little Juniata or Lehigh River case.
Police are reluctant to arrest anyone in these cases, because it is not known whether the person is breaking the law or not.
On the Little Juniata River, a few years before the court case, there was a "fish in" below the village of Spruce Creek. Several fishermen fished the posted stretch. A state policeman watched the whole thing but did not arrest anyone. And for good reason. It was not clear whether or not they were breaking the law.
At that point the navigability status of the LIttle Juniata was unknown.
At this point, the navigability of Tobyhanna Creek is unknown.