Sheriffs date back to the early 1300s. Even up until the 1970s, small communities had local militias and army reserves when things got beyond what a sheriff cou

Sheriffs date back to the early 1300s. Even up until the 1970s, small communities had local militias and army reserves when things got beyond what a sheriff could handle. Most of these places switched to policing in the late 70s and 80s. How, precisely is that "the ideological descendent of slave patrols"?