In the U.S., the legal limit for a driver’s blood alcohol concentration (BAC) is 0.08 grams of ethanol per hundred milliliters of blood. Ethanol is the chemical name for the type of alcohol that is found in alcoholic beverages. There are other kinds of alcohol, such as isopropanol that is used for medical applications, but that can be very harmful if ingested. That being said, there have been many cases over the years where people drank medical alcohol or even ate hand sanitizer and then drove drunk.
The reason there is a national legal limit, even though that would normally be reserved to the states to decide, is because, through the efforts of Mothers Against Drunk Driving (MADD), Congress passed a national drinking age law and tied it to highway funding. If the states do not comply, that would mean they do not get millions of dollars in federal highway money, so they are not likely to go against the federal limit. Continue reading
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