Testing for alcohol and testing for impairment are two totally different things.
Areas near Dallas are dry counties. You can bring it in and consume it but they still have the vestiges of prohibition.
They had a task force out busting people of “Public Intoxication” if they were observed drinking more than 2 beverages in an hour (no breath test or carnival games necessary to convict). $500 fine, thousands were written.
They’d bust people in the hotel bar of the hotel they were staying at.
Not rowdy people. But they were “drinking” beyond the arbitrary “legal limit”.
Good for financing.