Or let's go one further, "I'm sorry Mr. Protester, I can't have you influencing public policy until we know more about you. I need you do this urine test, fill out this mental health questionnaire, and we are going to feed your name into a government database. There's no problem here is there? We can't have public policy being changed by someone with mind altering drugs in their system or a history of mental illness."
That's logical, right?
IMHO every part of the Bill of Rights is there for a reason and needs to be protected equally.
Gaily bedight, A gallant knight In sunshine and in shadow, Had journeyed long, Singing a song, In search of El Dorado