While I'm well aware of the mindset that in anything outside of police procedurals, delving too deep into the actual intricacies of the operations of police precincts or what have you is often a waste of words and/or time, but at the same time, of course I need to know enough to give a detective reasonable motivation, reason and/or authority to investigate a crime scene. Do they work in groups and/or on their own? How would they be hired to investigate particular crimes or do surveillance on a particular person/group if they work in a group? How would they be hired to investigate particular crimes or do surveillance on a particular person/group if they work alone? If they work in a group, can they request jobs and/or are the jobs handed to them in a procedural manner? If they work alone, how seriously would people working in crime scene investigation or the judicial system take their words/how much stock would be put in their investigations, discoveries and accounts of what happened? What role do they play in the detainment of a criminal/suspect and their trials in court?