what is one example of a use of a judicial power?

Answer 1

the previous answerer had a genreal example, but i can give you something more current and specific: the Supreme Court ruled that the geneva Convention applies to the detainees at Guantanamo Bay. As well, they ruled that some of them are entitled to trials. the Executive branch (the bush Administration) had declared them 'enemy combatants,' and worked very hard to deny them basic protections.

Answer 2

The Supreme Cort ruling an act or law of congress unconstitutional.