LPR are just software. There are off the shelf programs designed to scan images and try to read what looks like a license plate. The software got so effective, cameras are now aimed to get a good image of plates.
The technology is like surveillance cameras in their infancy. Someone has to use the data. And the data has to still be around when it’s wanted. By the time the plates were fished out of the drain, who knows which agency kept the constant flip of plate numbers- LE isn’t going to want to give it up until they have to. I think a lot of data, like the data from a drive around patrol car with readers, is just tossed. Cameras reading vehicles entering and exiting parkways may be around longer. LE likes to find a pattern of travel for some cases.
I don’t believe any plate reader gives an alert when something is wrong. Like, “This tag should be on a brown Buick suburban but it’s on a white Honda Sedan!
” I believe the software just reads plates and sometimes describes the vehicle it’s on. (By the car’s appearance to the camera, not by the DMV records.) And keeps a list to search by those authorized to search it until the list is discarded. I imagine use of that info will become a point of contention some day. I can set up a camera to read all the plates that go by my house on the public street and keep it, but eventually, that is just going to get too intrusive. Same goes for, say, the federal government keeping records on federal roads.
Actually, they do this, if the parameters are set in that way on the reader. They pull over people all the time in cars bearing the wrong plates. Fd (or whoever) just got lucky when or if they used those plates, because nobody pulled over the car that had them on. I don’t know if they used them, or why nobody got pulled over with them, but I guess my point is that I doubt they were used on a long trip, where multiple LPRs would have been encountered. Fd (or whoever) might have used them going from Farmington to NC, if he didn’t know LPRs exist-I am just saying that I doubt it. So when might they have used, and where, and on what mission?