That's a decent starting point but there is a hell of a lot more to it than that. People routinely try mount their defense against the use of troops in law enforcement matters by simply citing the phrase "Posse Comitatus." Like A4's said, you really need to read up on it. However, just make sure you understand its context when you do. And for that, you'll need to get into the history of the events leading up to the act itself to really understand what is going on.A4sForever said:You figure it out ... and read up on Posse Comitatus.
For a quick and dirty treatise without reading a whole book ... try:
http://www.homelandsecurity.org/journal/articles/Trebilcock.htm