I am pretty sure Miami did this about 30+ years ago with the merger of the city police with the Dade County Police. There was a spiraling crime problem, the new Miami-Dade Police became much larger than the two previous departments. The rapid expansion brought many marginal types into the department. It was rough sledding for several years.
Metro Dade and Miami police are two distinct departments
Metro Dade can work the whole county
Miami much like Coral Gables or Miami Beach and countless other Dade municipalities has its own police department
Nashville has only Davidson metro cops with only two exceptions I think
Berry Hill and Belle Meade
Both tiny police departments
See: Jacksonville, FL. The largest city in area in FL,and the city/county consolidation created a unified police, the Jacksonville Sheriff’s Office. Jacksonville Police in the city limits are a division of the Sheriff’s office.
Since 1968, and not for liberal reasons-— money, and efficiency. They have their own prison. The Sheriff is an elected, State Constitutional officer.
https://en.wikipedia.org/wiki/Jacksonville_Sheriff%27s_Office
“No other city of Camden’s size has done anything quite like it.”
Charlotte police and Mecklenburg county combined their departments decades ago ...