You need a lawyer.
You need a lawyer.
I agree with AJ. If you want an answer you're going to have to indicate what state you are (and perhaps in what court) in and why you think there was some missing element or prejudice in your case. It's pretty hard with a grand jury in any means. The "rules or law" that apply are whatever rules of criminal procedure exist. Scaring up case law isn't going to fruitful absent any details.