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Springfield DWI and Blood Alcohol Legal Limit

Blood Alcohol Legal Limit

Many people are probably familiar with the phrase ‘blood alcohol’, but what does it really mean, and what are the legal issues pertaining to it? Simply put, blood alcohol is a measure of the amount of alcohol in a person’s system, and therefore the amount of impairment that person is experiencing. Blood alcohol content, commonly referred as BAC, goes up with every alcoholic beverage a person consumes, and it is measured by calculating the weight of ethanol, in grams, per 100 milliliters of blood. For instance, a BAC of .10 would indicate that the individual in question would have one part alcohol per thousand parts blood.


The blood alcohol legal limit is designed to be a separation point between those deemed too intoxicated to operate a motor vehicle and those under the limit. The actual figure is .08, which typically only takes a few alcoholic drinks to achieve. For example, a 140-lb woman would have a BAC of .10 if she had just three alcoholic drinks. BAC does go down over time as the body filters and processes it, but the rate is so slow that it takes up to six hours for someone barely over the legal limit of .08 to become sober. This is one of the main reasons why law enforcement officials take advantage of breathalyzer technology. It allows them to set a numerical limit and gives them proof that a driver is or is not over the limit. Such evidence is nearly impossible to deny in court.


First, it should be noted that the legal BAC limit only applies to drivers operating a motor vehicle. It is perfectly legal for passengers to exceed the limit, but the driver must remain sober. If a driver is caught over the legal limit and is found guilty of driving while intoxicated (DWI) in court, which is the common outcome thanks to breathalyzers, there are several potential consequences. Depending on the severity of the offense, DUI/DWI could include up to six months of jail time and fines from $500 to $1000. Someone convicted of DUI/DWI can also expect to have their driver’s license suspended for a significant period of time and up to three years for repeat offenders.