DUI means “Driving Under the Influence.” In Mississippi, DUI can be charged any time a person over the age of 21 operates a motor vehicle under the influence of drugs or alcohol.
To be considered under the influence of alcohol, you will show a blood alcohol content (BAC) of 0.08%. BAC is typically documented by a breath test. (Or what is known more commonly as a Breathalyzer test).
If you are under the influence of a controlled substance (such as marijuana or amphetamines), law enforcement may request a blood test to determine how much of that substance is present in your system.
In any case, DUI charges typically arise when someone is intoxicated to the point that they cannot drive safely.