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California can stop the spread

California rolled out its exposure alert system on Thursday.

Imagine that two people have Exposure Notifications turned on. If they come within six feet of each other for 15 minutes or more within a day, their phones will exchange keys (randomly generated, anonymous numbers) that log that close interaction.

Like a few other states, California is using the technology called Exposure Notifications Express from Apple and Google. The companies push notifications to everyone’s phones to encourage people to download the health department’s exposure notification app or change the phone’s settings to turn on the technology.


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