Are there special rules for, or special permissions to seek, in order to hide a cache on public Federal lands? Specifically, do any of the following organizations have an official stand one way or the other on hiding caches: BLM, USFS, F&G, Corps of Engineers, state land, etc?
If not, must you contact a representative if you want to cache on that organization's property? What type of resource manager would you talk to: realty, forestor, geologist, archealogist, etc.?