Can they legally do this? MAYBE inside the ticket-holders area, with the request of the event permitees, but to the areas open to the public? This is Nevada. Does the BLM have the authority to do this? If so, that means they have the authority to do it on all the lands that they manage in the state, Burning Man notwithstanding, and I don't think they have that authority.
Who can we ask for them to cite their authority?
Also, what is the penalty for violating this policy? Is the penalty for "weapon possession" the same as "use of a motorized vehicle"?