Effective Test & Trace will require the use location tracking. The google + Apple plan looks promising as a solution that addresses many of the privacy concerns.
From The Atlantic on 2020 04 12
It is also a world in which the return to normal is predicated on the introduction of a novel technology. Millions of Americans—many of whom might be deeply skeptical of government surveillance, or Big Tech—may become participants in a national project to track their own movements and interactions, to help public-health experts map out the spread of an invisible enemy.