[DanBC]

It's well known that drug dependency is a relatively good predictor of violent behaviour. People think severe mental illness predicts violent behaviour, but substance misuse is far better predictor.

Watch the video here: https://twitter.com/ProfLAppleby/status/917838820682489858?s...

[Diederich]

Both videos threw errors in playback.

The initial claim was 'usually turn violent', compared to your 'relatively good predictor of violent behaviour'.

I've known quite a few people with drug dependency problems and very, very few of them were violent.

So, citation still needed.