sobby , there's no indication that the action is completed. If the Clean Air Act is still in place, then its provisions can still fail, since the law continues to do (or fail to do) the same thing. Similarly, I might say "state law forbids the use of narcotics" or "the Farm Bill encourages farmers to grow surplus crops." We'd only use "failed" if the Act were no longer in place, and we don't know that that's the case.
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