I could take a quick stab at that.
I think the important thing to consider here is what we have available now, but that's rapidly evolving too, like inexpensive, easy to use, rapid screening tests. They're not diagnostic tests; they're screening tests. They are cheap, easy, point-of-care tests.
Are they going to be perfect? Of course not. We're talking about adding another layer of protection, and obviously, when purchased in bulk, it seems it would be a very feasible thing to do. That doesn't exist just yet, but it will shortly.