This has nothing to do with "intoxication" or sleep deprivation, or medical conditions. Some police will lie and charge people with "DUI" when there is zero justification, and they ruin lives because too many of them are sadistic assholes. It's in epidemic in Tennessee and other parts of the country, but it really could happen anywhere to anyone. Police unions are a problem, and taxpayers pay for the litigation when someone actually fights back against false charges.

So what? This line of argument can be used to dismiss essentially any crime, because police can always lie about whatever the particular crime is. It's not a principled reason not to have laws or enforce them.