Some states do communicate with the insurance companies. However, sometimes the insurance companies fail to notify the state (or the state fails to record it) a

Some states do communicate with the insurance companies. However, sometimes the insurance companies fail to notify the state (or the state fails to record it) and we get to have a friendly police interaction and sort the whole thing out in court. I imagine past some threshold, even if the cops do know that someone isn't insured it's just not worth running a whole anti-uninsured-driver campaign.