Final answer:
After one drink, a driver's ability to safely operate a vehicle can be reduced due to the impairing effects of alcohol on skills and judgment necessary for driving.
Step-by-step explanation:
After only one drink, a driver's ability to operate a vehicle can be reduced. Alcohol consumption affects performance of tasks that require skill and judgment, and it is illegal to drive while under the influence of alcohol. In most US states, a blood alcohol level of 0.08% is considered legally intoxicated. Even small amounts of alcohol can lead to a decrease in reaction time, visual acuity, and levels of alertness. It is essential to understand that the immediate effect of alcohol varies for each individual depending on various factors, but generally, responsibility starts with the very first drink.