Final answer:
Impairment of balance and movement typically occurs at a blood alcohol concentration (BAC) level of around 0.08% or higher.
Step-by-step explanation:
Impairment of balance and movement typically occurs at a blood alcohol concentration (BAC) level of around 0.08% or higher. At this level, a person may experience difficulty maintaining balance while walking, coordination problems, and impaired motor control. It is important to note that the effects of alcohol can vary between individuals, and tolerance levels can also play a role.