Settle an arguement for me...

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Ok, my husband and I were talking about his brother getting busted for under age drinking. This led to the question of wether he would get a DUI too. I said no because according to him he only drank two beers. I said two beers wouldn't have put him over the legal limit. My husband argues that drinking one beer would put anyone over the legal limit. This makes no sense to me because then no one would be able to drive home after having a drink at a bar or restaurant. So, can someone tell me how they figure out your blood alcohol content and if one beer would make you over the limit? I believe the limit here is .008