Final answer:
The best thing to sober up an intoxicated person is time. It takes at least five hours for a legally intoxicated person to achieve sobriety.
Step-by-step explanation:
The best thing to sober up an intoxicated person is time. Giving the liver enough time to fully metabolize the ingested alcohol is the only effective way to avoid alcohol toxicity. Drinking coffee or taking a shower will not help. The legal limit for intoxication is a BAC of 0.08. Taking into account the rate at which the liver metabolizes alcohol after drinking stops, and the alcohol excretion rate, it takes at least five hours for a legally intoxicated person to achieve sobriety.