Interesting - it looks like they've gone down the route of having a way for people to do a "digital handshake" (both press the button, and have devices within a

Interesting - it looks like they've gone down the route of having a way for people to do a "digital handshake" (both press the button, and have devices within a short distance of each other) to create their contact pairings. I do wonder how many people will use this feature, or remember to use it. This would seem to reduce false positives, but make it much less useful at scale (i.e. it won't help trace people who were on a train or bus).