[jaimex2]

Thanks for the insight.

Why wouldn't they just auto-alert anyone who came in adequate proximity to get tested though? Surely there is some benefit to letting people know they need to be extra careful now and get tested ASAP.

All the manual human work can continue as normal.

[crushthecurve]

If someone is determined as a close contact they have to legally self-isolate for 14 days regardless of symptoms or test results.

The policy there probably reflects the understanding that people in the early stages of infection won't test positive or exhibit symptoms.