Idaho Drifter/Govt. Cover
I took the scene dealing with the DNA....Dixon.....and the new chief to be that somebody within the government told the chief that they do not or should not look at the drifter guy as the suspect. Two excuses....not his DNA and out of the country. All under the umbrella of being classified.
I thought it also showed the black, new chief who the audience embraced as being the person to clean up the local mess turned out to be a patsy for the government to cover the tracks for the drifter guy.
Just my take.