We must do something to let people in this country know that addiction is something that can be treated and this epidemic of prescribed opioids is something that we can fix.

In 1999, Purdue Pharma the maker of OxyContin went on a massive marketing campaign. Back then, prescription opioids were only used in extreme cases - post surgery, end of life care, cancer pain. We use a clip from an ad in the film where they had a doctor saying, "Less than 1 percent of people who use prescription opioid long-term will become addicted" - that changed the mindset of physicians across the country.

We are having a public health response to this epidemic of prescription opioids. We are looking at treatment options, there are drugs being made available for treatments, and we aren't just throwing people in prison. So this is a very different response than the traditional criminal justice response that we have had to past drug epidemics.

There seems is predominantly a white person's drug addiction epidemic, so that's why you see white people in our film, Warning: This Drug May Kill You.

It seemed that the problem of Americans overdosing and dying from drug addiction was being described as bad people, particularly kids, who were abusing good drugs. But Sheila Nevins, the president of HBO Documentary Films, and I were particularly interested in finding out the stories of people and families who had been ravaged by this disease of addiction and understanding what really was happening. What we found was that, and let's not make any mistake about it, this is an epidemic of addiction.

We must do something to let people in this country know that addiction is something that can be treated and this epidemic of prescribed opioids is something that we can fix.

I really do think for the vast majority of cases, doctors didn't think they were doing anything wrong - they were doing what was being recommended at the time, and many times people were able to take these prescription opioids and not have a problem with it. But what we do know is that if we take these drugs long-term, dependency develops quickly, within as little as a week. What we all have to realize is that these pills are chemical cousins of heroin - one is an illegal opioid and one is legal, but they are relatives.