Personal observation of a police officer's last day on the job when he was injured at the premises where I worked at the time, 12 years ago... In discussion of the incident later on after it was officially and thoroughly investigated by both the police department, the state labor authorities and OSHA it is one of the more common non-criminal accidental line-of-duty injuries that are suffered by law enforcement officers right behind "accidentally" driving off the road and falling down icy steps... It isn't going to be something that gets tons of publicity as it is more often than not a result of the officer's personal ignorance and lack of proper training that cause such self- inflicted "accidents"... Which is why police departments often do not possess the tools anymore and will gladly open a vehicle in an emergency situation by applying a baton or spring loaded punch tool to the least expensive panel of glass on the vehicle nowadays...
You would only really know about such accidents if you worked for OSHA, law enforcement or a towing company...
Not everything that happens to the police makes the news, especially the things which only happened because of a mistake made by the officer when the situation can be controlled...
~~ Evan