Apple says COVID-19 contact tracing apps can include duration of proximity when deciding what is a proximity event, potentially limiting false positive pings (Casey Newton/The Verge)

Casey Newton / The Verge:
Apple says COVID-19 contact tracing apps can include duration of proximity when deciding what is a proximity event, potentially limiting false positive pings  —  Adoption is the hard part of contact tracing apps so far — but if it's baked into the operating system, it gets a lot easier

via Techmeme