Podcast:What Roman Mars Can Learn About Con Law Published On: Tue May 22 2018 Description: The Posse Comitatus Act limits the federal government’s ability to use the military to enforce domestic policy within the United States. However, this act has so many allowable exceptions, it has rarely been officially violated. When Trump suggests “The Feds” should police Chicago to get the murder rate down, he might have found the perfect example of a Posse Comitatus Act violation.