Final answer:
The only way to sober up a driver is by allowing them enough time for their liver to metabolize the alcohol. Other methods like coffee or cold showers do not work; sobriety can only be achieved over time, typically requiring several hours.
Step-by-step explanation:
The only thing that can sober up a driver is to give the liver ample time to metabolize the ingested alcohol. No other methods, such as drinking coffee or taking a shower, will speed up this process. The liver metabolizes alcohol at a certain rate, and it takes at least five hours for a legally intoxicated person to achieve sobriety after drinking stops.
The Field Sobriety Test (FST) can assess a person's level of impairment, but only the passage of time will reduce alcohol levels. A legally intoxicated person with a Blood Alcohol Concentration (BAC) of 0.08 will typically need at least five hours to metabolize the alcohol and achieve sobriety.