plate reading help police track down suspects without pursuit. video recording in general help police collect evidence necessary to convict reckless driving.

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rationalist 3 hours ago | parent [-]

It sounds like you're talking about solving crimes, not preventing crimes.

	▲	tonymet 2 hours ago \| parent [-]
		solving crime and convicting criminals has first and n-order effects. For one, a few criminals commit most crimes, so locking people up reduces many crimes. Secondly, convictions are a deterrent.