Michigan Attorney General Dana Nessel has reached a $3.1-billion dollar settlement with Walmart to resolve allegations that the company contributed to the opioid crisis by failing to appropriately oversee the dispensing of opioids at its stores.

The settlement will require significant improvements in how Walmart's pharmacies handle opioids.

The $3.1 billion dollars will be divided by states that sign on to the settlement, local governments, and tribes.

The money must be used to provide treatment and recovery services to people struggling with an opioid addiction.