These include things like reduction in non-health-related opioid use, mortality and morbidity (which include due to opioid overdose, HIV and viral hepatitis), lowering chance of crime and incarceration, greater retention in treatment, Standard of living and overall wellbeing. In the guidelines on community administration of opioid overdose, WHO suggests https://beckettpphbo.dgbloggers.com/38139031/the-2-minute-rule-for-what-is-the-drug-conolidine-used-for