On a National Police: Making one would require a large restructuring of our government, likely a constitutional convention. The reason is that guys like the FBI

On a National Police: Making one would require a large restructuring of our government, likely a constitutional convention. The reason is that guys like the FBI and ATF can only go after federal crimes which are de facto felonies and not misdemeanors (I may be totally wrong there, so please correct me). As such, the large majority of crimes are then under the states, as they do the day to day crime stuff, things like fraud, jay-walking, etc. Again, this is the US, so things are very convoluted and I may be wrong. To get a National Police, you'd have to give those rights to the Feds and not just the States, a very messy business that may result in successions. In addition, there are 300+ million Americans, so trying to impose 'law' on a Federal level and not in a State-resolution level would be crazy, as what works in Maine and what should be legal there is not something that may work in Arizona or Hawaii.