If traffic laws are about public safety, police officers would not frequently and casually speed. If public safety is simply about enforcing the law, then police officers would just pull people over continuously. Our streets are designed to facilitate speeding, and they generally succeed. Police departments could do nonstop enforcement of traffic laws as drivers everywhere are continuously breaking one of a myriad of traffic-related regulations. They do not do this. The decision by a police officer to intervene is then, nearly always, completely discretionary. The officer decides when, where,
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