“Every kind of peaceful cooperation among men is primarily based on mutual trust and only secondarily on institutions such as courts of justice and police.” ―Albert Einstein
The police officer is a friend and should be perceived and treated as such. Do not allow the sound bites to distort your perception of US police officers. There are always bad apples in every profession, and American police officers are not exempt.
First, it is important for you to know that the way the police force is organized in the United States of America is different from most parts of the world. Instead of a national police force as many countries have, each city and even some institutions like universities have their independent police force.
Expect to be treated well by police officers, believe that they have your best interest at heart until proven otherwise.
It is a NO! NO! NO! to open the door of your car and get out without the police officer asking you to do so. Please do not get out of your car.