Ireland's coronavirus contact-tracing app is now live, but the team behind England's will not give a launch date
Scientists at Trinity College in Dublin who advised the Irish app development team have produced a number of studies showing Bluetooth can be a very unreliable way to log contacts.
When I questioned whether Bluetooth could really do the job, an official told me that apps were public health tools, not scientific measuring instruments. He added that their accuracy should be measured against humans, who would be pretty poor at remembering how close they were to someone and for how long.
Incidentally, if public trust is vital to the app's rollout, the people of the Isle of Wight may have something to say about that.
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