The story was that a lawyer got his client off the hook for buying alcohol for a minor after the prosecution failed to introduce into evidence any paperwork that asserted Miller Draft was beer.
The prosecution filed the standard 'list of beers' letter that the states usually use afterwards as part of the "C'mon!" process.
As funny as the headline is, nobody is asserting that Miller isn't beer (though strong opinions exist), just that the prosecution fell down on the job by not producing EVIDENCE that it was alcoholic.