I think that almost every scene was an exploration - it was never going to be just what’s on the page. So I know I was very lucky - we all were - to work with a cast of this caliber. These are extremely experienced and intelligent actors, who are also deeply emotional and - as you say - are also engaged in the world.

I really feel that actors should really know who they are as characters; they should really study their lines; they should be prepared; but once they come to set, for me the most exciting way to shoot a scene is to really find it, really kind of grind your way through it, until you feel like you have something that you can put together.

I think that's an incredibly overwhelming reality that is really at the basis of how we're going to deal with this. Looking at the film, people will say, "Oh yeah, you're criticizing the police." I say, "No."

The first view is "bad apple." Bad apple is excusable. It's sort of like, something went bad with this man. But the second option is police corruption, so it's a problem with the department.

But the reality is that the police serve a certain function, to maintain a certain status quo, and that's one of the things that the movie is about, because it basically gives you three options for looking at the police, as symbolized by Dave Brown.

I mean, you always hope to have a part on every level, on every layer. For us it was very much a conversation about power and sexuality and brutality. And really all the issues that are in that world, in that space, come down to one word, which is "masculinity.

I think that almost every scene was an exploration - it was never going to be just what’s on the page. So I know I was very lucky - we all were - to work with a cast of this caliber. These are extremely experienced and intelligent actors, who are also deeply emotional and - as you say - are also engaged in the world.