What is the legal limit of blood alcohol concentration for adults in most states?

In most states, the legal limit of blood alcohol concentration (BAC) for adults is set at 0.08. This means that if a driver's BAC is 0.08 or higher, they are considered legally impaired for the purpose of driving. This standard is established to promote public safety and reduce the risk of accidents associated with alcohol consumption.

The figure of 0.08 is derived from extensive research indicating that at this level, an individual's ability to operate a vehicle safely is significantly compromised. This impairment can include reduced coordination, delayed reaction times, and poor judgment, which increase the likelihood of accidents.

While some other options mention different BAC levels, the 0.08 limit is widely recognized and enforced across the majority of the United States, while "zero tolerance" laws typically apply to underage drivers, where any detectable amount of alcohol can lead to penalties.