What is prosecutorial discretion and how can it result in selective or vindictive prosecution?

What is a motion to suppress evidence? Why is it particularly important to constitutional criminal procedure and, therefore, criminal justice professionals – especially law enforcement officers?
What is prosecutorial discretion and how can it result in selective or vindictive prosecution? What is a writ of certiorari? Under what circumstances might a court of last resort, like the U.S. Supreme Court, grant certiorari?

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