Heroin driving force behind crime trends

The most convincing aspects of Morgan’s hypothesis are the way that is able to match local crime rates with peak levels of heroin use (although, unfortunately, he has to use the now-defunct Addicts Index as the indicator of heroin dependency). Atypical areas where heroin use peaked earlier (Merseyside, Edinburgh and the Republic of Ireland) or not at all (Northern Ireland) show very close correlation between the rise and fall of crime rates.