Ask Sandra Bland if it made no difference who pulled her over. Or Eric Garner who asked him about selling loose cigarettes. Or Walter Scott. Or George Floyd. Or Michael Brown. Or Tamir Rice. Or 1000+ other people in the US every year who are killed by cops.

The professional background of and particulary the armament (or lack thereof) of the person checking whether a law / ordinance has been broken very often is the difference between life and death for the person being checked.