https://www.vox.com/recode/2020/10/2/21497729/covid-coronavirus-contact-tracing-app-apple-google-exposure-notification

New York and New Jersey are the latest states to use the Apple-Google exposure notification tool.

It may have gotten off to a slow start, but digital Covid-19 contact tracing apps are finally picking up steam in the United States — and may have surmounted one of their biggest obstacles to widespread use.