Maybe the research is worthless because of data quality issues. Pushing all the junkies on an area where people don't trust the police isn't a good way to have

Maybe the research is worthless because of data quality issues. Pushing all the junkies on an area where people don't trust the police isn't a good way to have accurate statistics on the increase (or lack of) in crime. But also there could be a feeling of insecurity that is disconnected from reality, but with the state of social sciences, hard to know...