Final answer:
The FBI does not believe in or consider the significance of Indian superstitions and broken stones; they have their own alternative solution.
Step-by-step explanation:
At the end of the novel, Leaphorn says, "The FBI isn't interested in Indian superstitions and broken stones. It's got another resolution in mind." This suggests that the FBI does not believe in or consider the significance of Indian superstitions and broken stones. Instead, they have their own alternative explanation or solution to the situation.