No, you don't multiply it by 50 to 70 vehicles. Usually, not every vehicle is stopped...it's predetermined which vehicles will be stopped but it must not be random. For example, every 10th vehicle or every vehicle. You may think it's a waste of time. But they usually are very productive in terms of catching drunk drivers though there is a perception, even among many police officers, that they're ineffective. At least in my experience they've been productive. But my experience is limited to only working a few checkpoints.






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