They do, especially in cities and wealthy suburbs (and honestly a lot of poor rural areas too).
replyThe difference is these typically don't zap that data up to a central database that any agency in the country can access, the way Flock does if only because the security people at Flock are a joke.
No they don’t. You are conflating “any” with “every”.
replyIn my city, the plate reader cop cars have 4 smallish boxes, each mounted above a quarter panel. At most about 1/20 of the police cars for my local PD has these installed.
It’s more likely that private sector cars have them installed because car repo companies will pay bounties for license plate hits on a car they have an active repo contract for.