He served as Marshal for South Dakota under me as President.

When, after the close of my term, I went to Africa, on getting back to Europe I cabled Seth Bullock to bring over Mrs.Bullock and meet me in London, which he did; by that time I felt that I just had to meet my own people, who spoke my neighborhood dialect.
When serving as deputy sheriff I was impressed with the advantage the officer of the law has over ordinary wrong-doers, provided he thoroughly knows his own mind.

There are exceptional outlaws, men with a price on their heads and of remarkable prowess, who are utterly indifferent to taking life, and whose warfare against society is as open as that of a savage on the war-path.

The law officer has no advantage whatever over these men save what his own prowess may--or may not--give him.

Such a man was Billy the Kid, the notorious man-killer and desperado of New Mexico, who was himself finally slain by a friend of mine, Pat Garrett, whom, when I was President, I made collector of customs at El Paso.
But the ordinary criminal, even when murderously inclined, feels just a moment's hesitation as to whether he cares to kill an officer of the law engaged in his duty.