This is a mix of different agency's, but its what I go by
-How/when a cop would and would not use his lights/siren
Priority calls, such as crimes in progress or when time is a factor. Locally, our officers can choose when to respond "Code 3"
-How/when cops use unmarked or partially marked vehicles
There's not really a statute, but our traffic section uses unmarked, and obviously gang enforcement so they can stay undetected
-When a cop would use deadly force
When the officer feels that without using lethal force, himself or others could be severely injured or killed. This is a sole judgement call on the part of the cop
-When/if a cop would ever use his vehicle as a weapon
Same answer as deadly force. If its going to stop the suspect from maiming or killing, its better to use it and answer for it in court
-When would a cop call off a chase
This is a touchy subject. If the suspect was being stopped for a simple infraction "summary in canada, or misdemeanor in America" and he runs at a high rate and dangerously, air units would be called and units would break pursuit. If he is wanted for severe infraction "Indictable in Canada, or Felony in America", the chase would continue as letting that suspect go could endanger more lives than the pursuit. In game, make a judgement call
-What are the different ways a cop would respond to a call i.e. obeying regular traffic laws/slightly modified traffic laws/going full on lights and sirens full "safe" speed
These are code calls.
Code 1 or non priority response, is to respond cold, all traffic laws and no lights or sirens.
Code 2 or expedited. This is a little different depending on agency, but usually normal speed and clearing intersections with lights
Code 3 or priority, is to respond hot. Fastest speed that is safe, lights and sirens.
Hope this helped