Bog-
Its the authority to TELL folks to leave the county land,
if they dont leave, you call the cops and and have them enforce your authority.

I doubt anyone would sign any contract
that puts a responsibility to enforce a rule on others without granting authority to do so
... would you sign a contract that had you take responsibility for folks you have no sway over?

Otherwise, we're talking about rolling down our windows on the hiway and yelling at a drunk driver... not our job but, we can call a cop to enforce the city/county/state laws

... well, maybe not Drunk Driver, that is a safety issue
while somebody that is a known AMA member is using 2.4 without pin .... is not a safety issue