Anders,
The objective of the TDA is to draft a standardized set of rules for poker tournaments. They are ment to supplement house rules. Rules may vary from casino to casino. In the United States, rules vary from state to state, and jurisdictions within each state may also be controlled by a State Gaming Agency, or Gaming Commission. There is not a Federal Agency (that I know of) that regulates poker rules.
If you are a new player to a casino, be sure to ask for a set of house rules so you know what you are getting into.