Subjective judgments. They are specifically not doing breathalyzers or field sobriety tests, they're pretty much going based on whether your behavior is considered disruptive or not. It's almost more "disturbing the peace" than "public intoxication," though the latter is still what you're charged with I believe.
There's been a huge uproar, and I expect the nonsense will cease shortly due to the PR nightmare it's turned into.
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