My understanding on this, is that there used to be some in National Parks, but some wise guy thought it would be cool to bury one, which has led to no buried caches (a good thing IMHO), and no caches in National Parks, which I think stinks to high Heaven.
There are some primo spots here in Garland County that can never be utilized due to this restriction. It's kind of a sore spot with me, given my proximity to Hot Springs.
Oh yeah, there are some places that are used for rock climbing here every day which is fine with them...as long as there is no cache at the end of it. Common sense, U.S. government style.
Guess what?! I got a fever, and the only prescription...is more cowbell!!