Border Patrol Agents - Is There a Ghost Agent?

Elmore considers this possibility in the book, and he writes, at first i thought maybe it was some agent with a sick sense of humor using the recent death to scare off a few poyos. However, many times over and over, this proved to absolutely not be the case. The groups always knew it was a spirit as he approached, yet none of them ever tried to run from the phantom agent. And there apparently was an vestimation of whether other agents could be involved.