When Tony Hillerman's characters refer to a "blue policeman," they are referencing Navajo "Law and Order" officers. His use of this colloquial term is in reference to the blue police unifoms that they wear.
"A special agent overlooks the Shiprock formation in the Navajo Nation in New Mexico, 2012" by FBI is licensed under Public Domain.
A01 The Blessing Way (01-07) p. 19 A01 The Blessing Way (01-07) p. 23 A01 The Blessing Way (01-07) p. 112 A01 The Blessing Way (01-07) p. 124
Tony Hillerman Portal