Detroit: Postal union warns mail slowdown could occur due to COVID, lack of contact tracing (employees not told when co-workers test positive) "Mail delivery for metro Detroiters has been getting back to normal after major delays at the start of the pandemic but now, some postal workers are warning another possible slowdown could occur. The reason? They say postal employees aren’t being told when their coworkers are testing positive for COVID-19, allowing the virus to spread inside their facilities."