Why was Prohibition a failure in the United States?

Prohibition ultimately failed because at least half the adult population wanted to carry on drinking, policing of the Volstead Act was riddled with contradictions, biases and corruption, and the lack of a specific ban on consumption hopelessly muddied the legal waters

Explanation:

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d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

answer; ewing's sarcoma;