In one sense, it's exactly what always-on cameras are meant to do: prevent police from ignoring the law when no one is watching. The goal is to limit brutality and baseless charges, but the mechanism works equally well against neglected charges and officer discretion.

The places that moved first on legal marijuana were the same ones that started with détente; I think there's some real substance to the idea that bans on harmless things erode because we see that nothing bad happens when they go unenforced. (For that matter, it's the same idea as people leaving cults when they break the rules in private and discover "hey, nothing bad happened!") Universal enforcement takes away a natural experiment on the results of non-enforcement.