Judicial Review
Judicial review is an example of checks and balances in the sense that the Supreme Court can review and invalidate laws proposed by the Legislative and Executive branches.
Any time a new law is admitted, the Supreme Court has to process and accept it. In some other countries, courts are a form of hierarchy as well, the more serious issues tried in higher courts. In the U.S, it's pretty much separated from state and federal.
http://www.law.cornell.edu/wex/judicial_review
http://constitutionality.us/SupremeCourt.html
Any time a new law is admitted, the Supreme Court has to process and accept it. In some other countries, courts are a form of hierarchy as well, the more serious issues tried in higher courts. In the U.S, it's pretty much separated from state and federal.
http://www.law.cornell.edu/wex/judicial_review
http://constitutionality.us/SupremeCourt.html