Ex post facto laws are specifically prohibited by the Constitution.
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One power would be judicial review, which the supreme court uses to not only declare laws unconstitutional, but also the actions of the President or Congress. Another power would be the ability to interpret the constitution.
judges if laws and acts of the legislative and executive branches are constitutional
Yes! It makes sure that all laws run smoothly and people follow the laws. This branch includes the Supreme Court and juries and other people.
The power of a court to judge the constitutionality of laws was established in Marbury v. Madison. In that case, the Supreme Court held that the constitution gives the courts the power to interpret the laws applying the constitution.
Supreme court justices decide if laws are constitutional.