Constitutional and moral issues aside.
How many impaired drivers being caught isn't really a good indicator though. If it's properly used as a deterrent, then there should be less drunk drivers on the road to begin with. The ideal outcome for this would be 0 DUIs issued as no one got on the road drunk.
It's a bit of a catch 22, because if it catches more, than it can be seen as a success. If it catches less, then it probably actually did a good job in deterring drunk drivers.
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