Can you give an example of an organization that does this screening process properly, as a role model? My church, grocery store, and local bars, to give a few

Can you give an example of an organization that does this screening process properly, as a role model? My church, grocery store, and local bars, to give a few examples, don't give me an advance lists of attendees to scren before I show up somewhere. If I see someone I can't be near, one of us has to leave. Thankfully, this collision happens only occasional