Read the precedents. There's no question that infectious disease carriers can be forcibly quarantined. But forcing apparently healthy people to undergo an invasive medical procedure (a search) in order to exercise their right to assemble would be another thing altogether. And long-term curfews for adults have never been upheld.

We've already banned or severely restricted the right to assemble in like 40+ states, and there's not much reason to believe that won't survive court challenges.