looking for covid transmission information - anyone know of any tests were asymptomatic covid+ people, unmasked, casually walked closely (within six feet) past a cotton swab or a cotton net or any 'particle-collection device' installed to replicate a store, church, concert, sporting-event, bar, restaurant, or maybe a Thanksgiving dinner setting and the experiment controllers found a positive result after, say, an hour or two of those people walking past as they would normally?