If I remember correctly from a radio story, the police can listen to a recording of the shot report before investigating to confirm it sounds like a gun.
> Police locking up black people in America is the reason police in America were created.
Formal policing in America has a long and sometimes infamous history, but it definitely did not begin with "locking up black people"; it varied based on the locale.
For example, in NYC, it goes back to the Tammany Hall days and was notoriously corrupt.
In the west (where there were very few black people, and those that were there were free), police forces began with various marshals and sheriffs who were hired, typically by the merchants, to tame the wild western towns.
According to Time, "The first publicly funded, organized police force with officers on duty full-time was created in Boston in 1838."
>In the west (where there were very few black people
According to Smithsonian Magazine, 1 in 4 cowboys were black. I suspect popular culture (movies) are what's to blame for this misconception. Many fled to the West after the Civil War to find work.