I spend quite a bit of time on the Clinch. I have no problem with anyone keeping fish as long as they are going about in legally. I have seen everything you can think of except any authority figure. I have NEVER been asked by anyone to see a license or trout stamp.
I volunteered for one of the brookie restoration projects in the park a while back. There were a few TWRA guys there and one of them asked what I thought of the slot limit after finding out where I lived. I explained to him that I felt it was a joke because no one seemed to pay any attention to it. He assured me that his people were down there checking. Again, I have NEVER seen anyone down there. The signs explaining the slot limit are tiny.