Cite the law to which you refer....
The laws vary depending on jurisdiction, but the majority are starting to conform to this paradigm.
6.2 Policing Public Demonstrations and Crowd Control | Ethics in Law Enforcement
You're fucking deranged.
That's not a law, ya dipshit;
it's a fucking student textbook (BC Open Textbooks - BCcampus). 
And it's not even from the U.S., it's from
British Columbia, Canada.
You know, Canada, who doesn't have a Second Amendment like ours.
Seriously, what the fuck is wrong with you? How on G-d's green Earth do you post that to defend your earlier idiocy? Hell, not only is it not law, not only is it textbook material, not only is it from Canada and not the U.S.,
but it doesn't even state what you claimed.
Nowhere in there does it state that protesters armed with
"clubs and other accouterments" are subject to arrest for merely carrying those weapons. The only weapons it discusses are the weapons police use to maintain crowd control during a protest.