The rise of the modern police force in a relatively modern phenomenon. Policing in early America was a hodgepodge of constables, sheriffs , night watchmen and justices of the peace. The Boston Night Watch was established in 1631. These were usually poorly paid and untrained. Moreover, although they were paid, it was more of a stipend than a salary. All officers had to have another profession that put food on the table. In my Will Rees series, series, Rouge runs a tavern.
Bands of citizens, like a more powerful Neighborhood watch, was another system employed to keep order. Too often, they became groups of zealots who went after anyone of whom they disapproved.
As the populations increased, especially cities like Boston and New York, port cities where immigrants arrived, these patchwork systems were quickly overwhelmed.
Attempts as establishing some kind of security force were tried. The wealthy usually hired their own men to protect themselves and their possessions. A system that paid the men with rewards was also tried. But abuse was rampant. Innocent men were hanged for crimes so the ‘detective’ could collect the reward.
London was the first city to set up a trained, professional force: the Metropolitan Police. This was a country-wide force with trained officers and it quickly became a model for the United States. New York City became the first police force modeled on the ‘bobbies’. (The American system, however, was decentralized. Politicians chose the officers and they reported to a neighborhood precinct house. Cronyism and corruption were constant problems.) The police did not wear uniforms until 1853, in New York City.
Boston began experimenting with a police force modeled on the British in 1837. By 1860, all large American cities had established full time police forces.
In the late 1700s and early 1800s, when Rees is investigating, there was no such thing as a police force.