> It's rare though, from what I see, for a DUI case to be about anything other than BAC. I have no actual statistics on that. That's because BAC is easy to mea

> It's rare though, from what I see, for a DUI case to be about anything other than BAC. I have no actual statistics on that. That's because BAC is easy to measure. If you want to prosecute for BAC, you just need trusted test results. If you want to prosecute for impaired driving in general, you need to prove actual impairment, which is tough. This is why MADD campaigned for the .08 limit nationwide. It's easy to enforce.