Section A: The power they could use is Judicial Review.
Section B: This power would allow the Judicial Branch of the Government to investigate, or review the law that either the Legislative branch passed or the Executive Branch (The legislative branch can be reviewed since they have power to override a Presidential Veto)
In fact research shows that 75% of false convictions are caused by a inaccurate eyewitness statement. This means up to 100 innocent people could be wrongfully convicted each year