Back in the late 80's I wrote an article for the Police Marksman publication titled Traffic Stops the Armored Car perspective. In that article I outlined 3 incidents where the baddies were outfitted with complete authentic police uniforms. In one case both crew members were killed, in another one crew member was pistol whipped and suffered permanent injury. Shortly after I wrote the article and right before it was published another incident occurred.
Fast forward to 2007 and one of the instructors at one of my NRA Instructors courses knew the gentleman who provided the uniforms to the perps in the incident that the 2 crewmen lost their lives. The incident occurred in and the instructor was from Arizona and my class was outside Pittsburg PA. It's a Small world.
This stuff happens more than most civilian and police realize. Truly I really don't know what I would do if the door came crashing down and people started yelling police. Unless you know you are a criminal yourself any which way your taking a chance that it will end badly.