The ATF has released the latest version of their book on explosives law known as the "orange book". I haven't received my copy yet but it can be downloaded here.

I keep my copy in my laptop computer case for easy reference. Sometimes I know the rules and the law better than the ATF inspectors they send out. If you are going to play with Tannerite or Target-Master targets you should know both local and Federal law. Then don't do stupid stuff.