I wish I had a quality, well calibrated breathalyzer for my own use. I almost never drive after even one drink, let alone enough to approach the limit. Still, when I was younger I drove a couple times I probably shouldn't have. Even still, I think I was more paranoid about being pulled over than buzzed. I'd be surprised if I was 0.1.
I've seen little cheap ones for sale, but I'm pretty sure they're worthless.
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