Couple of thoughts on the headline. My guess is the Federals are afraid to go into Mexico because they are afraid of being arrested for the Fast and Furious gun running scheme. At this stage of the game, I am not the fan of Arpaio most here are.
Official State Department travel warning for Mexico, as of October 10, 2014:
http://travel.state.gov/content/passports/english/alertswarnings/mexico-travel-warning.html
Who the hell would want to go into that third-world toilet of a country anyway?