Considering the arming of narco-terrorist gangs, the destabilizing geopolitical effect on Mexico, the foreign policy ramifications, and the possibility of extrajudicial and criminal activity at the highest levels of the executive branch, a special prosecutor should be just one avenue of investigation. This could possibly lead to prison for senior administration officials and an indictment against President Barack Obama himself.
When you are done that little tidbit of shocker, read this next...
Fast and Furious was supposed to prove the theory. That is, the administration "knew" who the bad guys were -- legitimate gun dealers in the Southwest -- and set out to make them the heavies in a phony sting operation.