@ehBeth,
I've often thought the 'layers' of law enforcement agencies in the US raises administrative burdens, demolishes common standards, and leads to jurisdictional infighting.
In Aus we have state police forces (we only have 6 states and 1 territory) and the Federal Police who handle policing in the territories (apart from the one mentioned in the previous parentheses) and the Australian Federal Police (AFP):
Federal agents are based in each Australian state and territory capital city, internationally and form the largest component of the AFP staff, federal agents chiefly perform criminal investigative duties.
Current areas of focus for the AFP:
Illicit drug trafficking
Organised people smuggling;
Human Trafficking, including sexual servitude and human exploitation;
Serious major fraud against the government
High-tech crime involving information technology and communications
Prevention, countering and investigation of terrorism
Transnational and multi-jurisdictional crime
Money laundering
Organised crime
The US system of federal, state, county, municipal with 50 states seems gobsmackingly unwieldy from this distance.