Are you referring to this encounter ? :
http://www.treasurenet.com/forums/general-discussion/482748-squaws-leap-ca.html
If so, that was not a case of "kicked out", was it ? That was a case of "asked ahead, and got the safe answer" routine.
I realize some folks might say: " What's the difference ? A 'no' and a 'scram' amount to the same thing after all" Eh ? Thus the source of the lady's "no" might be a moot point. So let me say this :
ANY time an md'r fetches a "no" or a "scram" on public land, does not necessarily constitute gospel law. I mean, sure, give "lip service" at the time. But going forward, I do not necessarily construe any stink eye or bad-hair-day "no", to constitute law. NOT unless I found something that truly said "no md'ing" in actual rules/laws.
Hence someone might ask: "Why not argue with the lady, show her the chapter and verse, etc... ?" Here's why: Because they can use various ancillary verbiage to say it violates something else. Eg.: Harvest and remove. Or alter and deface. Or cultural heritage, etc... You can certainly try to debate them on that (especially in the case of BLM, which has an express allowance). But if you ask me, I'd just give lip service, and come back later when the singular busy-body isn't around. Some people might call that "sneaking around". Ok, fine then: sneak around