[polynox]

I think what makes your definition confusing or misleading is the concept of dual sovereignty.

Under the concept of dual sovereignty in a federal system (such as the United States, Russia, Canada, or India), conduct can be legal or illegal under each of the sovereigns independently. At least post-Lochner era there are many laws that are in this scope.

An example that might test your definition would be recreational use of marijuana which is legal in some states but illegal federally. It would be at best misleading to say that "US law permits the recreational use of marijuana" even though it meets your definition.