 Unlike the constitutional oversight of the Supreme Court of the United States, laws might be challenged at any time by any citizen and are not decided in a case by case basis but are directly decided upon on abstract.In other words, the plaintiff does not have to demonstrate he has been harmed by the law or that he has any legitimate interest on the decision, all he has to do is to allege why he considers the law to be unconstitutional even if the consequences of said unconstitutionality have not yet been realized or are merely implicit.The mechanism by which the court hears unconstitutionally cases is the Public Action of Unconstitutionality which dates back to 1910.