JUDY WOODRUFF:

We return to our series on the opioid epidemic, America Addicted.

In a moment, William Brangham looks at how federal law enforcement was undermined when it came to stopping shipments of the drugs.

Let's begin with a report from the Southwest.

While states nationwide have been scrambling to tackle the crisis, New Mexico has been hard at work with an aggressive response for years. And yet its death rate from overdoses remains stubbornly high.

Hari Sreenivasan begins our report in northern New Mexico.

DR. GINA PEREZ-BARON, Las Clinicas del Norte: How'd your week go this week?