Of course the usual pre-requisite substance abuse problems.
If you get the chance, "Once Were Brothers" is worthwhile watching, at least for Ronnie's take, straight from the horse's mouth.
The rest of it seems tilted for Robertson (who co-produced).
The real story is out there somewhere~ I just haven't found it yet.

ETA:

I as actually a "pro-sumer" part of that Yonge St. scene mentioned in the film.
It was a heckuva lotta fun.


-D.S.