Back in May, the Associated Press published the first piece in a groundbreaking series concluding that, after 40 years and more than $1 trillion spent, America’s war on drugs “has failed to meet any of its goals.” Today, as part of the same series, the AP looks specifically at U.S. enforcement strategy toward drug cartels in Mexico, and concludes that even record-level arrests and seizures have failed absolutely to curb the power of the violent gangs that control vast swaths of northern Mexico and…