Is the Mountain Lion, Puma, Couger Alive and well in the wilds of Pennsylvania? Your Thoughts?

It was suppose to have become extinct in the 1880"s*. I saw one in Brookville Pa. drinking from a stream in the early 60"s*. There have been reports of them in Clinton, Potter, Bedford, Tioga Counties and other Counties in Pa.*Have you seen any or found signs of them like hair, blood,feces, foot prints? Pictures or Videos*...