And Another 2.0

I saw this over the weekend, but I had no idea the guy died.

The party line is that the deputy mistook his handgun as a taser. Question: Is it possible to make a mistake like that?)  I guess it is possible (I'm on record as saying anything is possible), but how likely is that?

And how about the rest of the cops just ignoring the gunshot wound and the soon to be dead guy's cry for air?

(The deputy has been charged with manslaughter -- a crime which can be be understood as killing someone by a stupid, yet unintentional, act.)