Publication of the United States Government Interagency Domestic Terrorism how the Federal government would respond to a potential or actual terrorist threat or by the Federal government to combat both domestic and international terrorism DOD has many unique capabilities for dealing with a WMD and combating.
The mission of the Department of Justice (DOJ) is to enforce the law and defend the interests of the United States according to the law; to ensure public safety against threats foreign and domestic; to provide federal leadership in preventing and controlling crime; to seek just punishment for those guilty of unlawful things.
I got this from different websites, I don't know if it is right...