Final answer:
The law recognizes that impairment begins when a person has a blood alcohol concentration (BAC) at 0.08%.
Step-by-step explanation:
The law recognizes that impairment begins when a person has a blood alcohol concentration (BAC) at 0.08%. This means that if a person's blood alcohol concentration reaches or exceeds 0.08%, they are considered legally impaired and should not be driving or engaging in activities that require skill and judgment.