Walmart has agreed to a $3.1 billion settlement with state and local governments nationwide over its role in the devastating opioid epidemic. The deal will need to be approved by 43 states before it can be finalized. As part of the agreement, Walmart will have to submit to oversight measures, work to prevent fraudulent prescriptions and flag suspicious ones. Earlier this month, CVS and Walgreens proposed similar settlements for roughly $5 billion each. Over 500,000 deaths in the U.S. over the past two decades have been linked to opioids, both prescription and illicit.