they couldn't, for example, make a list of everyone who was parked near a protest, and then search a database to see where they were parked over the next two weeks
modern computer vision has changed all that, giving rise to massive dragnet surveillance; we should figure out how to get back the privacy we've lost
i don't think taping dead leaves to your license plate is going to solve the problem
prohibiting police from using computer vision isn't it either; they'll just buy the data from a private vendor like ring