"or through a brief conversation"
.. except we're under no obligation to answer Police questions, identify ourselves, show ID, or any of that;
"Stop and question: police powers
A police officer might stop you and ask:
what your name is
what you’re doing in the area
where you’re going
You don’t have to stop or answer any questions. If you don’t and there’s no other reason to suspect you, then this alone can’t be used as a reason to search or arrest you."
Now, a crappy facial recognition system with a 98% false positive rate I wouldn't count as a good reason to play ball with the Police here. Of course, the Police arent going to explain they don't have the power to ramdomly interrogate the populace based on false intel, but the takeaway here really should be we are under no obligation to co-operate. It's time to assert our rights as citizens, push back, 'cos we're certainly getting pushed.