Coronavirus app could trace your contacts without sacrificing your privacy

The app could also “cause a false fear” in people if it tells them they might have been in contact with an infected person, said  Andrew Noymer, an associate professor of public health at the University of California at Irvine. That worry could be compounded by the difficulty of actually getting tested afterward. “This is a well-intentioned scheme that’s going to have zero public health impact,” Noymer said.