To be clear: gunshot detection is mostly bullshit. By contrast, I don't think there's (substantial?) disagreement about the true-positive rate for red-light cam

To be clear: gunshot detection is mostly bullshit. By contrast, I don't think there's (substantial?) disagreement about the true-positive rate for red-light cameras: municipalities that tend to let people off do so not because the violation didn't occur, but because the violation was deemed subjectively to be insufficiently serious. (I believe strongly in personal privacy, and I don't buy the argument that red light cameras are a meaningful erosion thereof. Driving is a privilege that's extended with the expectation of safe behavior, which is why you're required to drive in a publicly identifiable vehicle with a government-issued license on your person. With that being said, I would happily support any local legislation that limits unconditional data collection from red-light cameras.)