How do you engage and approach a patient presenting with psychotic symptoms who has demonstrated a pattern of malingering and also has polysubstance use disorder?  

This is a nice general summary of some basics, non-judgemental, supportive approach, quiet/low stimulation environment: Mental Health First Aid Guidelines. With regards to malingering and how to approach it, try to determine the real want/need (housing or food insecurity?) and if it is something th...