Saw a video of a Doctor discussing this term "asymptomatic" the other day. He points out that everyone is asymptomatic" until they develop symptoms, and that can be anywhere from 12 days up to 28 days.
Have these bums been without symptoms for 28 days?
“Out of the people from Pine Street Inn who were isolated after positive test results, O’Connell says, one ended up in the hospital and some developed mild cold symptoms.” - https://www.wbur.org/commonhealth/2020/04/15/boston-homeless-population-coronavirus-asymptomatic-universal-testing