And, crucially, cops are expensive, so the percentage of drivers they can do this to is low. Whereas a stationary camera can scan the license plates of ~100% o

And, crucially, cops are expensive, so the percentage of drivers they can do this to is low. Whereas a stationary camera can scan the license plates of ~100% of cars that go past it and save that data for later fishing expeditions. And is cheap enough that we can (and have) blanketed roads with them.