I am horrified that the helpline couldn't help.
Why tell you to ring if they weren't able to offer guidance.
They ran a Q and A session some time ago on the legal sutuation surrounding DAs and OCDs so they must have contacts in the legal world who understand the drug- induced compulsions leading to criminal behaviour.
My dealings have been with Leigh Day in London.
They have people who understand the situation but we're unable to take action against the drug companies.
Contact details on the Internet.
You could try ringing and ask for advice and contacts in your area.
I do wish you luck as it could so easily have been us in that situation and many PWP have faced this.