I think the .08 limit is fine, but I think the enforcement of the limit is what matters. If cops are setting up roadblocks and randomly targeting people, they will get people who might be at .09 and are still pretty much fine to drive. I would think that is unfair.
But if they are only testing people who are weaving all over the road and giving them other probable cause, then the .08 limit serves as a way of inflating how serious the incident is. They are that much further over the limit because the limit is so low.
I also think the low .08 limit is a real deterrent. I know it works for me.
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