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Not sure if you are implying this or not, but how would lowering the BAC limit prevent fatal crashes?

Figure 3 in this report shows a somewhat normal distribution around .15 g/dl and the mode being around .17 g/dl: https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/...

This is already ~2x the legal limit.

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Google being what it is these days, I’m finding it difficult to track down the study that was performed a decade after British Columbia reduced the BAC limit and instituted severe penalties for DWI offences, so you’ll have to trust me when I say that there was a significant and long-lasting reduction in DWI cases and automobile accident rates.

Our BAC limit is 0.05, except for new drivers, where it is 0.0.

http://www.dui.ca/bc.php

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