Except Voronwe that you are limiting the definition to just one little aspect of a much bigger job. And in this case the person is purposelly crafting a definition just to meet their own peculiar criteria.
To frame the definition that way is ridiculous since it neglects to consider all the things a police officer does in the normal execution of their many duties.
His definition did not include (as you put it) that term with others but simply stated that that one lone item was his criteria of judging. And that is just plain ridiculous.