A grand jury is a legal body that is empowered to conduct official proceedings to investigate potential criminal conduct and to determine whether criminal charges should be brought. A grand jury may compel the production of documents and may compel the sworn testimony of witnesses to appear before it. A grand jury is separate from the courts, which do not preside over its functioning.[1]
What was that you said about "credibility"?
Maybe "guess again" was too complicated a concept for you. When you're completely clueless, Wikipedia ain't necessarily your friend.
The grand jur*Y*, through the prosecutor guiding it, can issue subpoenas requesting appearance and/or other evidence. A grand jur*OR* sits and observes the presentation of that evidence by the prosecutor.
It ain't like a grand jurOR can just demand you empty your pockets, though if you were serving as one, I could see it happening.
