Seems like this cop had issues with his past police employment, emotionally unstable, did not follow instructions, safety issues. Maybe if his past employment and behavior history was reviewed, he would have not been out on duty that day. Document showing a request for his termination in the past, but it appears he resigned instead. http://www.buzzfeed.com/alisonvingiano/loehmann-independence-records
The problem in many police departments AND most government jobs around the country is that politicians have a say in who is or isn't hired regardless of civil service exam scores. Government jobs are used for political favors. I've seen towns around here have to rescore tests and got caught hiring criminals. It's well known that without a politician as a personal reference on your application which is code for hire this person or personal "word" you are finished as an applicant regardless of score. Many hires police and other positions are almost untouchable depending on who put in the word for them on the application or to a hiring committee. It does come down to politics.