HaMagen (Hebrew for “The Shield”) tracks your close encounters using Bluetooth and cross-references those contacts with GPS information. When a user tests positive, an alerts is sent to their close contacts along with the time and location of the encounter. Users can then confirm or reject the encounter as a significant contact based on what they were doing at that time. This element is likely supposed to reduce false positive alerts since users can judge for themselves if the app properly registered a close contact. Once an alert is confirmed, users are referred to the Ministry of Health website for information on how to proceed. Hamagen is supported by involuntary contact tracing using cell phone location in the Shin Bet database. Shin Bet is Israel’s internal security office, similar to the FBI.