The customs halls coming into the USA are mind-blowingly poorly thought out. Basically, no matter where you're coming from, you go into this one vast room, stand in line for a long time staring at the walls (because you're not allowed to use your phone for some insane reason) and all around you are people who have come from everywhere. There's no air curtains to keep whatever's in there in there, there's no protocols for presorting people into groups from "high risk" areas into a semi-isolated area, there's zero in the way of medical staff, there's no hand sanitizer available, the fingerprint machines are sort of cleaned between each use, but not really that well. It's not a great thing.