LA has a new COVID-19 contact tracing app, from a controversial source

Since the COVID-19 pandemic first came to Los Angeles in the spring, the county Department of Public Health has hired nearly 2,600 people to do the manual work of contact tracing: asking people who test positive for the coronavirus to list everywhere they’ve been and everyone they’ve seen in recent days, then tracking down anyone they’ve encountered and testing them before they spread the virus further.