Questions about where people have been, whom they've seen and how they're feeling are becoming commonplace. So are mobile apps that track potential coronavirus exposure. Contact tracing has taken on greater prominence in recent months as society copes with Covid-19. As with physical health screenings, there are data privacy concerns and travel management considerations.
Health authorities have used contact tracing for decades. Traditionally, that involves interviews of those infected or exposed. This prompts more people to get tested and, if necessary, self-isolate . . .