One thing people often forget when making a documentary is that, in a sense, you still have to cast, find a star, and it has all of those built-in challenges.

I knew as a young boy that addiction and alcoholism afflict people - good, loving people - in profound ways, and that some people - usually from those rare "normal" families that I longed for as a child and as an adult wonder if they even exist - didn't understand this and sort of looked down their noses at people suffering with addiction.

In the same way that we want to expand mental health service for people with mental illness, we also need to make sure that our police officers are getting the mental health help they need.

If you just think about the difficulty you'll never get anywhere.

I don't think that there is any hard and fast rule that says that documentary has to be linear at all.

We don't see many films in which someone with schizophrenia is the main character.

I think it would be really hypocritical of me to make the films I make, where I delve into people's lives, to say that my life can't be looked at or that I have to be this pristine, isolated figure.