Exposure Notification - Wikipedia
https://en.wikipedia.org/wiki/Exposure_Notification#Adoption
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｜originally written by Lin
這套技術不會 GPS 定位，而是使用手機與手機之間的藍芽信號強弱，每支手機將會紀錄自己所接觸過的其他手機的匿名資訊。COVID-19 確診者可以透過暴露通知 app 告知自己有確診，過去 14 天有接觸史的手機使用者則會收到通知。因此，這個暴露通知系統仰賴整個社會有足夠多的人使用，方能有效。
References
【Google / Apple 接觸者追蹤技術】各國採用狀況
https://en.wikipedia.org/wiki/Exposure_Notification#Adoption
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