App downloaded and running.
It broadcasts a random code over bluetooth while listening for other random codes and remembering any that were too close for too long. Every once in a while, it checks your remembered list of codes against those of known cases. Doesn't remember where it happened, doesn't use your real name.
Google, Facebook, etc already do much more tracking of your whereabouts...they just don't correlate that to covid19 cases.
Unsolicited seeds with mysterious coating are being mailed from China to thousands of Canadians and