My grandfather was a police Chief. One day, in their infinite wisdom, the powers that be issued an edict that the police were required to fire a warning shot.
This was in the days of the .38 revolver being standard issue. In the morning pre-shift briefing, his officers were instructed henceforth to visit the range prior to going on-shift so that they could fire their warning shot.
If accuracy is measured, likely a GREAT idea.