The visual quality of the cameras now is such that you can shoot with available light, and if people are willing to mount a microphone on the camera and maybe even on the subject, then you're good to go.

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

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.

If the subject is no longer living, the immediate question is do you have enough first-person material to really get that story across. You'd like to avoid it just being other people's memories and interpretations.

Mental health treatment is most likely available to the officers, but they may be reluctant to access it due to cultural beliefs within the force, fear of stigma, etc.

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

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